Fix ANTLR when LU content contains only comments

[sw-joelmut]

#minor

Description

This PR fixes an issue when using LU content with only comments.

Specific Changes

• Revert previous changes related to addressing when using only comments, as the solution caused a few problems inside nested functionalities.

Testing

The following image shows the tests passing successfully and a testing case that detected a previous solution failure (which is not included in the source code yet).

[coveralls]

Pull Request Test Coverage Report for Build 384416

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.009%) to 78.4%

---

Files with Coverage Reduction	New Missed Lines	%
/libraries/Microsoft.Bot.Connector.Streaming/Application/TimerAwaitable.cs	1	68.25%
/libraries/AdaptiveExpressions/LRUCache.cs	4	87.18%

Totals
Change from base Build 384373:	0.009%
Covered Lines:	26184
Relevant Lines:	33398

---

💛 - Coveralls