If you delete a repository which is being used as a source root by a project, browsing to that project 500s

We need to either:

a) remove the source roots from projects when their repository is deleted
b) not allow the deletion of a repo which is being used by a project

java.lang.IllegalArgumentException: repHandle cannot be null
at com.cenqua.fisheye.web.util.RepositoryUtil.hasPermission(RepositoryUtil.java:109)
at com.cenqua.fisheye.web.ProjectPageAction.filterOnPermission(ProjectPageAction.java:133)
at com.cenqua.fisheye.web.ProjectPageAction.execute(ProjectPageAction.java:111)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:358)
at com.opensymphony.xwork.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:218)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:192)
at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.j