fix: check if row is present when setting aria label of popup element

[babalaui]

Issue #, if available:

Description of changes:

• added check if rowData of popup row is not null. in some scenarios when no popup item was selected when opening the popup, the rowData was null, resulting in a crash when setting the aria label of the popup element.

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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 87.08%. Comparing base (a27e1e8) to head (1fa0673).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5750   +/-   ##
=======================================
  Coverage   87.08%   87.08%           
=======================================
  Files         598      598           
  Lines       43802    43803    +1     
  Branches     7171     7172    +1     
=======================================
+ Hits        38144    38145    +1     
  Misses       5658     5658           

Flag	Coverage Δ
unittests	87.08% <100.00%> (+<0.01%)	⬆️

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