4.2: delete virtual site fails

I created a new virtual site. I accessed to it and created a new page. Then I deleted this site in the admin (no reboot of the server meanwhile). This generates a good exception in the admin center.

1560375 INFO [org.jahia.bin.Jahia] - Processed [/jahia/Jahia/site/fsdfsd/pid/29/op/edit] user=[root] ip=[127.0.0.1] in [172ms]
1563281 INFO [org.jahia.services.search.SearchEngine] - Started
1566687 INFO [org.jahia.bin.Jahia] - Processed [/jahia/Jahia/engineName/search/site/fsdfsd/op/edit/pid/29] user=[root] ip=[127.0.0.1] in [3422ms]
1673156 INFO [org.jahia.bin.Jahia] - Processed [/jahia/Jahia/site/fsdfsd/op/edit/pid/29] user=[root] ip=[127.0.0.1] in [16ms]
1677500 ERROR [org.jahia.params.ParamBean] - Unable to check server name validity: fsdfsd
1679250 ERROR [org.jahia.params.ParamBean] - Unable to check server name validity: fsdfsd
1680812 ERROR [org.jahia.params.ParamBean] - Unable to check server name validity: fsdfsd
1682625 ERROR [org.jahia.params.ParamBean] - Unable to check server name validity: fsdfsd
1692796 ERROR [org.jahia.params.ParamBean] - Unable to check server name validity: fsdfsd
org.jahia.services.acl.ACLNotFoundException: Access Control List not found., ACL [445] could not be found.
at org.jahia.services.acl.JahiaACLManagerService.lookupACL(JahiaACLManagerService.java:253)
at org.jahia.services.acl.JahiaAbstractACL.load(JahiaAbstractACL.java:226)
at org.jahia.services.acl.JahiaAbstractACL.<init>(JahiaAbstractACL.java:126)
at org.jahia.services.acl.JahiaBaseACL.<init>(JahiaBaseACL.java:60)
at org.jahia.services.fields.ContentField.getACL(ContentField.java:186)
at org.jahia.services.fields.ContentField.purge(ContentField.java:833)
at org.jahia.services.containers.JahiaContainersBaseService.purgeContainer(JahiaContainersBaseService.java:2577)
at org.jahia.services.containers.JahiaContainersBaseService.purgeContainerList(JahiaContainersBaseService.java:2623)
at org.jahia.services.containers.JahiaContainersBaseService.purgePageContainerLists(JahiaContainersBaseService.java:2682)
at org.jahia.services.pages.ContentPage.purge(ContentPage.java:2035)
at org.jahia.admin.sites.ManageSites.processDelete(ManageSites.java:1779)
at org.jahia.admin.sites.ManageSites.userRequestDispatcher(ManageSites.java:196)
at org.jahia.admin.sites.ManageSites.<init>(ManageSites.java:155)
at org.jahia.bin.JahiaAdministration.userRequestDispatcher(JahiaAdministration.java:371)
at org.jahia.bin.JahiaAdministration.service(JahiaAdministration.java:255)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:619)
1701234 ERROR [org.jahia.bin.JahiaErrorDisplay] - ERROR : Technical Exception, Technical Exception
java.lang.NullPointerException
at org.jahia.services.fields.ContentField.purge(ContentField.java:834)
at org.jahia.services.containers.JahiaContainersBaseService.purgeContainer(JahiaContainersBaseService.java:2577)
at org.jahia.services.containers.JahiaContainersBaseService.purgeContainerList(JahiaContainersBaseService.java:2623)
at org.jahia.services.containers.JahiaContainersBaseService.purgePageContainerLists(JahiaContainersBaseService.java:2682)
at org.jahia.services.pages.ContentPage.purge(ContentPage.java:2035)
at org.jahia.admin.sites.ManageSites.processDelete(ManageSites.java:1779)
at org.jahia.admin.sites.ManageSites.userRequestDispatcher(ManageSites.java:196)
at org.jahia.admin.sites.ManageSites.<init>(ManageSites.java:155)
at org.jahia.bin.JahiaAdministration.userRequestDispatcher(JahiaAdministration.java:371)
at org.jahia.bin.JahiaAdministration.service(JahiaAdministration.java:255)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:619)
1701640 INFO [org.jahia.services.database.ConnectionDispenser] - abortConnection : org.jahia.services.database.ConnectionDispenser$ConnectionInfo@a3fcb7
1701640 INFO [org.jahia.services.database.ConnectionDispenser] - abortConnection : null