Merge pull request #148 from DenisKnoepfle/master

Fix bug in ViewUpdater where hierarchy tree was not fetched again
Add check for empty hierarchy and add not detected problems in diagnosis

Change-Id: I18348f969e4ede3386bc016988cc981a255d8c36
Signed-off-by: Denis Knoepfle <denis.knoepfle@sap.com>