while without body. Fixes #444

[Konstantin8105]

Close #444
See #67

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This change is 

[codecov]

Codecov Report

Merging #447 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #447      +/-   ##
==========================================
+ Coverage   81.03%   81.04%   +<.01%     
==========================================
  Files         145      145              
  Lines        6434     6436       +2     
==========================================
+ Hits         5214     5216       +2     
  Misses        962      962              
  Partials      258      258

Impacted Files	Coverage Δ
transpiler/branch.go	75.89% <100%> (+0.24%)	⬆️

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[elliotchance]

Reviewed 2 of 2 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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