fix: apply class to autocomplete popup for no suggestions state

[akoreman]

Issue #, if available: NA

Description of changes: Apply class when autocomplete popup is in the 'no suggestions' state to allow separate styling of that state.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Pull Request Checklist:

• No backwards incompatible changes were made to Ace's public interface which is defined through the main typings file (ace.d.ts) and its references:
  • https://github.com/ajaxorg/ace/blob/master/ace.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-modes.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-extensions.d.ts

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.57%. Comparing base (3e9a61f) to head (377d108).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5522   +/-   ##
=======================================
  Coverage   86.56%   86.57%           
=======================================
  Files         588      588           
  Lines       42576    42600   +24     
  Branches     7071     7071           
=======================================
+ Hits        36858    36882   +24     
  Misses       5718     5718           

Flag	Coverage Δ
unittests	86.57% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.