fix: sometimes Enter does not auto trigger in Java when Java extension is installed

[leigaol]

Problem

In certain cases, when a user hit Enter in certain languages, the documentChangeEvent has a empty string. This is a valid auto trigger. In fact user only input Enter but the IDE decides to add some other documentChangeEvents

Solution

Enable auto trigger for this case.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.15%. Comparing base (68adf18) to head (2cc561a).

Files with missing lines	Patch %	Lines
...rver/inline-completion/auto-trigger/autoTrigger.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2005   +/-   ##
=======================================
  Coverage   61.15%   61.15%           
=======================================
  Files         239      239           
  Lines       52115    52116    +1     
  Branches     3127     3129    +2     
=======================================
+ Hits        31869    31874    +5     
+ Misses      20187    20183    -4     
  Partials       59       59           

Flag	Coverage Δ
unittests	61.15% <0.00%> (+<0.01%)	⬆️

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