Fix default for session_event in .send() to match SESSION_NONE as specified by comments at top of class.
Fix default for session_event in .send() to match SESSION_NONE as specified by comments at top of class.

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