[1075211] Cannot set custom value for Baseline - High property
This really only is a problem when there is not yet a baseline.  Which is
rare and typically just between import and the next run of the DataCalcJob.
It's not really easy to generate a manually set baseline from scratch, so
I'm just taking the approach of better messaging and error handling:
- Fix error handling such that the root cause of the issue is displayed
  when the save fails.
- provide better error handling and provide more specific messaging
- remove the confusing refresh icon (which was sort of acting like a save
  option. So, just hitting return is the way to save.
- Hide the edit box when saving.
- protect against GeneralUnhandledException when saving without setting a
  value.

Cherry-Pick master 351ab615a83988fda4780df4461d621372eb135a