Bugfix for handling PS1 catalog column metadata

[snbianco]

Some users have reported issues with queries to the PanSTARRS catalog due to inconsistencies in column metadata. We're in the midst of making updates to the service, and some columns are returning metadata that don't have certain keys we look for.

This PR updates the code that parses columns to be more robust to these inconsistencies. A column's name can come from column_name, or as a backup, name. If description doesn't exist, an empty string is used in its place. If either a column name or datatype can't be found, then the column is skipped. This won't impact what query methods return, but it will prevent a user from filtering on that particular column in queries.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 71.73%. Comparing base (ef48060) to head (8d9cf1a).
⚠️ Report is 20 commits behind head on main.

Files with missing lines	Patch %	Lines
astroquery/mast/collections.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3485      +/-   ##
==========================================
+ Coverage   71.72%   71.73%   +0.01%     
==========================================
  Files         235      235              
  Lines       20253    20258       +5     
==========================================
+ Hits        14527    14533       +6     
+ Misses       5726     5725       -1     

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[bsipocz]

This looks good to me, thanks!