Allows empty one-line comments.

[zslayton]

Issue #, if available:
#425

Description of changes:
Modifies the comment parser to allow empty comments.

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

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 🎉

Comparison is base (2140858) 90.39% compared to head (6b9237f) 90.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #474      +/-   ##
==========================================
+ Coverage   90.39%   90.42%   +0.02%     
==========================================
  Files          77       77              
  Lines       14177    14179       +2     
==========================================
+ Hits        12816    12821       +5     
+ Misses       1361     1358       -3     

Impacted Files	Coverage Δ
src/text/parsers/comments.rs	100.00% <100.00%> (ø)
src/text/non_blocking/raw_text_reader.rs	93.28% <0.00%> (+0.11%)	⬆️
src/text/parsers/timestamp.rs	90.31% <0.00%> (+0.38%)	⬆️
src/reader.rs	83.02% <0.00%> (+0.45%)	⬆️

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