Add a safety check for undefined line in getFoldWidgetRange funct…

[farkaskrisztian]

If you start typing 'CASE', an error occurs because there is no 'END' and the line variable is undefined.

Add a safety check for undefined line in getFoldWidgetRange funct…

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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

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.84%. Comparing base (e9c0810) to head (06a1bab).

Files with missing lines	Patch %	Lines
src/mode/folding/sqlserver.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## master #5871 +/- ## ======================================= Coverage 87.84% 87.84% ======================================= Files 622 622 Lines 46388 46388 Branches 7605 7605 ======================================= Hits 40750 40750 Misses 5638 5638 

Flag	Coverage Δ
unittests	87.84% <0.00%> (ø)

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