fix(da): custom API empty query not work

[SLdragon]

Bug 33071328: [VS]chat with your data - custom API prompt command doesn't work

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.42%. Comparing base (cbd5d6d) to head (bc81fb7).
Report is 2 commits behind head on release/VS1714P7.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/VS1714P7   #14109   +/-   ##
=================================================
  Coverage             90.42%   90.42%           
=================================================
  Files                   639      639           
  Lines                 38526    38526           
  Branches               7599     7644   +45     
=================================================
  Hits                  34839    34839           
  Misses                 1584     1584           
  Partials               2103     2103           

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