fixed issue in parser when trying to parse empty loop blocks

[andschenk]

This pull request fixes: #70

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.79%. Comparing base (5b19406) to head (a303f39).
Report is 17 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   80.93%   82.79%   +1.85%     
==========================================
  Files           7        7              
  Lines         278      308      +30     
==========================================
+ Hits          225      255      +30     
  Misses         53       53              

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[alisterburt]

Awesome work! Thanks @andschenk
closes #70

[alisterburt]

@andschenk by the way, in case you're interested the group of us who maintain/develop teamtomo packages have an informal quarterly meeting and discuss the project at https://imagesc.zulipchat.com/#narrow/channel/426493-TeamTomo - we just had a meeting this morning but it would be great to see you at the next one! 🙂