stevedlawrence opened a new pull request #334: Add a special unparser for empty choice branches URL: https://github.com/apache/incubator-daffodil/pull/334 When unparsing a choice, it is possible that the default branch to unparsing could be completely empty (e.g. a sequence with a parse only assertion). In these cases, that empty branch optimizes to a NadaUnparser. Normally NadaUnparser's are optimized out or else they will throw an error at runtime. However, the choice combinator unparse still expects to have an Unparser to unparse, even if it does nothing. To support this, this creates an empty choice branch unparser that does nothing, but allows for the choice combinator to have something to unparse. DAFFODIL-2296
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