Re: logicalrep_message_type throws an error

logicalrep_message_type() is used to convert logical message type code

into name while prepared error context or details. Thus when this

function is called probably an ERROR is already raised. If

logicalrep_message_type() gets an unknown message type, it will throw

an error, which will suppress the error for which we are building

context or details. That's not useful. I think instead

logicalrep_message_type() should return "unknown" when it encounters

an unknown message type and let the original error message be thrown

as is.