RoundUp version: 0.7.5
File: roundupdb.py
Error: Edit Error: no such msg node None
Error line: 223 -> messages.set(msgid, 
messageid=messageid)

Comment:
The document string of 
method 'IssueClass.nosymessage' indicates that 
a 'System Message' mail is send to the CC list if 
the 'msgid' is None. But 
method 'IssueClass.send_message' will raise the above 
error at the line 223 (see above), because the method 
creates a new message id and tries to store it in the 
database for node 'msgid' which is None.