Fix recursion error when eo band name is missing

[gadomski]

Related Issue(s):

• Closes Calling bands property on a pystac.extensions.eo.EOExtension can result in RecursionError #1402

Description:

Fixed simply by using get on the properties dict instead of the accessor.

PR Checklist:

• pre-commit hooks pass locally
• 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.20%. Comparing base (5f53e6e) to head (9baf1be).
Report is 31 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1406   +/-   ##
=======================================
  Coverage   91.20%   91.20%           
=======================================
  Files          52       52           
  Lines        7239     7239           
  Branches     1019     1019           
=======================================
  Hits         6602     6602           
  Misses        457      457           
  Partials      180      180           

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[jsignell]

LGTM 👏 👏