Verifying if an application error handler can be coded in such a way that MVC dispatch can be restored
Removing early return that would prevent error listeners from restoring application runtime
Removing unused code/callbacks, minor cleanups
Merge branch 'hotfix/6009'

Close #6009
Fixes #4750
Fixes #5842
Fixes doctrine/DoctrineModule#215
Merge pull request #6024 from Ocramius/hotfix/mvc-dispatch-error-should-be-preventable

Dispatch error should be preventable
[#6024] Removed redundant conditional
Merge branch 'hotfix/6024' into develop

Forward port #6024