Case for empty segmentation image selector added to visbility change in QmitkSegmentationView.
Merge branch 'bug-18139-CrashOnSegmentationDataNodePropertyChange' into tempBranch
Open the warning dialog prior to number of regions actualization, depending on the region number spin box value instead.
Merge branch 'bug-18278-OtsuSegmentationPreviewInactiveOnCancelingDialog'