Improved error reporting in the week view when there are no rooms

git-svn-id: http://svn.code.sf.net/p/mrbs/code/mrbs/trunk@2789 25f7e783-145e-4f2d-a9f8-dd7182bfe9c7
Removed redundant code

git-svn-id: http://svn.code.sf.net/p/mrbs/code/mrbs/trunk@2790 25f7e783-145e-4f2d-a9f8-dd7182bfe9c7