DM-46781: Allow no matching results in a query datasets call on command line

[timj]

Generally this hasn't been a problem because each matching collection is only querying dataset types where there are non-zero datasets.

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes
• (if changing dimensions.yaml) make a copy of dimensions.yaml in configs/old_dimensions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.73%. Comparing base (b419f0f) to head (b0f8f95).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1093      +/-   ##
==========================================
- Coverage   89.74%   89.73%   -0.01%     
==========================================
  Files         361      361              
  Lines       47308    47308              
  Branches     9722     5765    -3957     
==========================================
- Hits        42455    42451       -4     
- Misses       3500     3502       +2     
- Partials     1353     1355       +2     

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