(fix): handle no docs in source code

[ilan-gold]

See https://github.com/python/cpython/blob/main/Lib/inspect.py#L949-L1006 for the source code yielding the error

Error raised from CI here: scverse/anndata#1997

Under most circumstances, blanket catching an OSError seems like a bad idea, but I'm not sure ripping the messages out of the source code and checking them one-by-one is a much better idea, especially since OSError is the documented behavior: https://docs.python.org/3/library/inspect.html#inspect.getsourcelines

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (334cbe0) to head (7247ab3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #214   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           16        16           
  Lines          511       511           
=========================================
  Hits           511       511           

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