Fix paths to saved sub-catalogs

[duckontheweb]

Related Issue(s):

• Closes Incorrect path to saved sub-catalogs #713

Description:

Fixes the paths to which sub-catalogs are saved by ensuring that the dest_href argument to Catalog.save is a directory when called on child catalogs.

PR Checklist:

• Code is formatted (run pre-commit run --all-files)
• Tests pass (run scripts/test)
• Documentation has been updated to reflect changes, if applicable
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.31%. Comparing base (70faaa5) to head (f79f8ee).
⚠️ Report is 738 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #714      +/-   ##
==========================================
+ Coverage   94.30%   94.31%   +0.01%     
==========================================
  Files          77       77              
  Lines       11249    11269      +20     
  Branches     1342     1344       +2     
==========================================
+ Hits        10608    10628      +20     
  Misses        461      461              
  Partials      180      180              

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[duckontheweb]

cc: @KennSmithDS