fix: fall back to epsg

[gadomski]

Related Issue(s):

• Closes Version 1.12.0 breaks ProjectionExtension.crs_string for items using projection extension <2 #1503
• Follow-on to discuss migrate-by-default here: Migrate by default #1504

Description:

If a STAC item is not migrated to the latest version, it would be missing its code attribute. This means that epsg would be none, even if the incoming dicitonary had an epsg.

I'll want to release this as a bugfix when merged.

cc @Kirill888

PR Checklist:

• Pre-commit hooks and tests pass (run scripts/test)
• 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.47%. Comparing base (7ac7560) to head (6260209).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1505   +/-   ##
=======================================
  Coverage   91.47%   91.47%           
=======================================
  Files          54       54           
  Lines        7518     7520    +2     
  Branches      909      910    +1     
=======================================
+ Hits         6877     6879    +2     
  Misses        457      457           
  Partials      184      184           

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[jsignell]

Thanks @gadomski. This is a good fix.