fix regex for short_message == None detect_multipart fixed with test in python-smpp
fix regex for short_message == None
detect_multipart fixed with test in python-smpp

TouK/vumi,TouK/vumi,harrissoerja/vumi,vishwaprakashmishra/xmatrix,harrissoerja/vumi,TouK/vumi,harrissoerja/vumi,vishwaprakashmishra/xmatrix,vishwaprakashmishra/xmatrix