Don't allow to set short-cuts for actions that are menus.


git-svn-id: http://cantata.googlecode.com/svn/trunk@5643 b1e49159-3266-923f-9c3e-04f16369770a
Only show output change notification if outputs menu was not previously empty.


git-svn-id: http://cantata.googlecode.com/svn/trunk@5644 b1e49159-3266-923f-9c3e-04f16369770a