Only strip paragraphs that don't contain verses

[ddaspit]

• fixes Too many paragraph markers are being stripped when using paragraph_behavior=STRIP #183

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This change is 

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.21429% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.91%. Comparing base (17fe20d) to head (3f93d92).

Files with missing lines	Patch %	Lines
machine/corpora/update_usfm_parser_handler.py	96.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
+ Coverage   88.89%   88.91%   +0.02%     
==========================================
  Files         282      282              
  Lines       16977    17024      +47     
==========================================
+ Hits        15091    15137      +46     
- Misses       1886     1887       +1     

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[Enkidu93]

Reviewed 4 of 4 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ddaspit)

[isaac091]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ddaspit)