Logged In: YES 
user_id=1080231

I agree, the summary isn't that clear. Well let me give it
an other try.
In the past when a email was send to the nosy list, it would
either send a message starting with '<user> added the
comment:' or with 'System message:'. The first one was send
if a message was added to the issue. The last one was send
if no message was add to the issue but some property was
changes (this was only the case if the nosy detector was
changed). In that case no *msgid* was passed to the
*nosymessage* method. Currently this last behavior is broken
due to the lines mentioned in the summary above. If *msgid*
is None, the author will be set to '1' (admin). The result
is that the message to the nosy list will start with 'admin
added the comment:' and not with 'System message:'.

I hope this will clear it up.