Pull request #1084: CAS-14816
Merge in CASA/casa6 from CAS-14816 to master
* commit '5ee2bae61611ff32759385db05d2686835b7dd18':
Add a test for CAS-14816
fall back to whole-cube stats when outside-mask region is empty
Restore SDMaskHandler.cc to pre-recent-changes baseline (cb65c9b710)
fix crash in calcRobustImageStatistics when outside-mask region is empty or too small
fall back to whole-cube stats when outside-mask region is empty
harden statsind indexing and mask slicer dimensionality in robust stats
fix std::min type mismatch in skipChannels
also add dimensionality checks to old robust stats and the fullmask condition
add dimensionality checks to statistics calculation
fix automasking skipChan segfault - try2
