Redmine

When a user attempts to access an existing page without having the good permission, redmine show a blank screen instead
of a explanation page as for the 404 error.

It's really painful when a user had access to a project, create issue about it and then, lose its privileges upon the
project: on the "my page", it still view its issues, but get the blank screen if he try to reach them.

Reproducible: always
Steps:
1) Create a project and give permission to User A
2) User A create a issue.
3) Check that User A see the issue on "my page"
4) Withdraw permission on the project for User A
5) Reconnect User A
6) User A go to its "my page" view, click on the created issue

boom blank screen.

Log show a 403 error:

Processing IssuesController#show (for 127.0.0.1 at 2007-04-30 17:27:56) [GET]
Session ID: 407a22c49aec94478cf335a0d137e805
Parameters: {"action"=>"show", "id"=>"4",
"controller"=>"issues"}
Filter chain halted as [#<ActionController::Filters::ClassMethods::SymbolFilter:
0x4697554 @filter=:authorize>] returned false.
Completed in 0.20300 (4 reqs/sec) | Rendering: 0.00000 (0%) | DB: 0.15700 (77%) | 403 Forbidden [http://localhost/issues/show/4]