allow optional output assignments, empty assignments will be ignored …

[99NIMI]

…in codegen

[codecov-commenter]

Codecov Report

Merging #437 (6b663cf) into master (0d5289f) will increase coverage by 0.00%.
The diff coverage is 82.35%.

@@           Coverage Diff           @@
##           master     #437   +/-   ##
=======================================
  Coverage   93.32%   93.33%           
=======================================
  Files          32       32           
  Lines       12001    12003    +2     
=======================================
+ Hits        11200    11203    +3     
+ Misses        801      800    -1     

Impacted Files	Coverage Δ
src/codegen/generators/expression_generator.rs	88.51% <82.35%> (+0.01%)	⬆️
src/index.rs	97.31% <0.00%> (-0.72%)	⬇️
src/validation.rs	93.10% <0.00%> (+2.46%)	⬆️

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[riederm]

cool