[DotNet] Fix generation of classes that accept optional lists as constructor arguments#249

mpkorstanje merged 4 commits intocucumber:maincucumber/messages:mainfrom

clrudolphi:DotNet_FixHandlingOfNullConstructorArguments_InGeneratedCodeclrudolphi/messages:DotNet_FixHandlingOfNullConstructorArguments_InGeneratedCodeCopy head branch name to clipboard