stevedlawrence opened a new pull request #340: Support empty choice branches with direct dispatch URL: https://github.com/apache/incubator-daffodil/pull/340 When parsing a direct dispatch choice, it's possible one of the choice branches is an empty sequences. This optimizes to a NadaParser which cannot be used at runtime. So when this happens, instead use a custom parser that does nothing, but allows for the ChoiceCombinatorParser to have a parser to run for that branch. The logic already exists for non-direct dispatch choices--this just uses that same parser, though moved to a choice specific file and rename to be consistent with the equivalent unparser and make the "choice" aspect of it more apparent. DAFFODIL-2306
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