pycodegen: deal with anonymous types better

[mr-c]

The Python version of #423

Part of the fix for common-workflow-language/cwl-utils#71

[lgtm-com]

This pull request introduces 5 alerts when merging 440d845 into b2abeb5 - view on LGTM.com

new alerts:

• 5 for Testing equality to None

[codecov]

Codecov Report

Merging #428 (b119fe9) into main (5fccc55) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #428   +/-   ##
=======================================
  Coverage   79.49%   79.49%           
=======================================
  Files          18       18           
  Lines        3268     3268           
  Branches      880      880           
=======================================
  Hits         2598     2598           
  Misses        438      438           
  Partials      232      232           

Impacted Files	Coverage Δ
schema_salad/python_codegen.py	95.27% <ø> (ø)

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