A message must have a non-empty command #14
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I'm not sure how strict this parser is intended to be, but I have a light wrapper around it to make a transform stream and was writing tests when I encountered a few unexpected failures.
According to the pseudo BNF in RFC1459, the command part of a message is required and must be at least 1 character (1+ letters or exactly 3 digits, but that's a separate issue if it's wanted). This change makes the parser treat empty string and things like ": " as malformed in the same way that it already treats ":".