support for no priority as specified in rfc3164 section 4.3.3 #57
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rfc3164 section 4.3.3 allows sending messages without the priority prefix. See: https://tools.ietf.org/html/rfc3164#section-4.3.3 . This PR adds support for the case that no priority is specified. It affects both working in automatic and rfc3164 modes.