Fix read_generic_wrapper test

[melonora]

The test failed on the last assert. This because the code generates a ValueError. With click this does not end up in the output but in the atttribute exc_info. Lastly, the error message was also different from the error message in the assert.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.53%. Comparing base (296d9a5) to head (386b634).
Report is 157 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #301       +/-   ##
===========================================
+ Coverage   39.16%   49.53%   +10.37%     
===========================================
  Files          26       26               
  Lines        2663     2709       +46     
===========================================
+ Hits         1043     1342      +299     
+ Misses       1620     1367      -253     

see 12 files with indirect coverage changes

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