Workaround to avoid duplicate annotations

[cgrtrifork]

HumanSignal/label-studio#6312 causes an extra call to predict when 'Submit' is clicked, causing duplicate predictions. This is a workaround that shouldn't impact the functionality (handling an edge case that shouldn't happen anyway) and will prevent the problem by returning empty annotations the second time (when the prompt is duplicated).

This assumes the auto-annotation has been used before clicking submit. If it weren't used then the prompt length would be 1 and this fix wouldn't work. As stated, this is a workaround, the real fix should be to avoid LabelStudio calling the prediction endpoint on submit.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.97%. Comparing base (38974da) to head (73fc1f2).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #618      +/-   ##
==========================================
- Coverage   49.13%   46.97%   -2.17%     
==========================================
  Files          41       11      -30     
  Lines        2825      611    -2214     
==========================================
- Hits         1388      287    -1101     
+ Misses       1437      324    -1113     

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