PIPE-1527: changed calc_zenith_angle to calc_zd_pa and modified calc_wide_field_pos_cor to accept zd and pa to limit duplicate code; updated positioncorrection_test to reflect changes
Pull request #888: CAS-14475
Merge in CASA/casa6 from CAS-14475 to master
* commit '7bbdef7336ded306041268fb77d452055533f4e7':
Update casaconfig to 1.0.2
Add casaconfig==1.0.1.dev14475 to build.conf
Exclude casaconfig in runtest.py
added casaconfig==1.0.2.dev1 to pick up test casaconfig for this ticket
CAS-14201: Fix bug with mask=[]
If mask is passed in as an empty list, in the case of niter=0 the return
dictionary construction fell over. os.path.exists() wants an empty
string, but if an empty list was passed in it threw a KeyError.
This is now fixed by putting in the appropriate guard rails before it
gets to os.path.exists. The length of the input mask is tested, so
regardless of empty string or list it will catch it there.
