Fix sort by similarity for datasets with a color scheme

[benjaminpkane]

The /sort route is currently used only to ensure a dist_field is correctly populated if the parameter is provided. Before routing updates, this meant a new dataset scheme was needed in the response. Omitting the response prevents serialization errors when a dataset has a color_scheme

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7eaeee9) 15.86% compared to head (b856f15) 15.86%.

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v0.23.3    #3958   +/-   ##
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  Coverage            15.86%   15.86%           
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  Files                  731      731           
  Lines                81853    81853           
  Branches              1093     1093           
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  Hits                 12987    12987           
  Misses               68866    68866           

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[sashankaryal]

sounds good 🐐