fix(editor): autocomplete should only save empty when val is null

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.7%. Comparing base (bb19008) to head (bb19008).

❗ Current head bb19008 differs from pull request most recent head a722c97. Consider uploading reports for the commit a722c97 to get more accurate results

Additional details and impacted files

@@          Coverage Diff          @@
##            next   #1500   +/-   ##
=====================================
  Coverage   99.7%   99.7%           
=====================================
  Files        197     197           
  Lines      21607   21607           
  Branches    7191    7191           
=====================================
  Hits       21541   21541           
  Misses        60      60           
  Partials       6       6           

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