Account for collections with no stable / final releases

[briantist]

Fixes #87

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (2b3be89) 55.06% compared to head (a79414e) 56.77%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
+ Coverage   55.06%   56.77%   +1.70%     
==========================================
  Files          26       27       +1     
  Lines         977     1011      +34     
==========================================
+ Hits          538      574      +36     
+ Misses        439      437       -2     

Files	Coverage Δ
galactory/utilities.py	44.87% <100.00%> (+1.64%)	⬆️
tests/unit/utilities/test_collected_collections.py	100.00% <100.00%> (ø)
tests/unit/utilities/test_discover_collections.py	100.00% <100.00%> (ø)
tests/unit/utilities/test_utilities.py	100.00% <100.00%> (ø)

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[briantist]

I'm glad I introduced a failing test for the issue before starting the fix. The lack of failure in Python 3.10 and 3.11 led to #90