fix: handle backend responses more gracefully in datasets requests

[mortenpi]

Handles problematic dataset list backend responses more gracefully, by printing one warning per call, rather than throwing an error.

Also, unrelated to the main change, but makes the auth argument of the internal _get_datasets function positional, for consistency.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7394f23) 78.37% compared to head (7f4762e) 78.49%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
+ Coverage   78.37%   78.49%   +0.11%     
==========================================
  Files          16       16              
  Lines        2234     2241       +7     
==========================================
+ Hits         1751     1759       +8     
+ Misses        483      482       -1     

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