In some circumstances, the 'oldvalues' argument to
generateChangeNote (roundupdb.py, line 578) is a
string, not a dictionary.  

I've seen this with mailgw and ZRoundup.  At least in
the case of mailgw, the string is the message trailer
(property list).

A temporary workaround is to catch the AttributeError
exception and return an "error" string instead.

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The problem seems to be caused by the combination of these
two lines in "nosryreaction.py" (extended template, version
0.4.1)

            change_note = cl.generateChangeNote(nodeid,
oldvalues)
            cl.sendmessage(nodeid, msgid, change_note)

The third argument to sendmessage() is supposed to be a
dict.  (it is frontend agnostic)  This appears to be fixed
in the CVS version.  I'll find out soon enough ...

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