watching tickets fails if any fields are empty

[Robert Corsaro]

AnnouncementSystem failed. Traceback (most recent call last):   
  File "/home/oforge/code/optaros-oforge/trunk/oforge/trac-hacks/announcerplugin/announcerplugin/api.py", line 378, in _real_send     distributor.distribute(transport, packages[transport], evt)   
  File "/home/oforge/code/optaros-oforge/trunk/oforge/trac-hacks/announcerplugin/announcerplugin/distributors/email_distributor.py", line 207, in distribute     self._do_send(transport, event, format, messages[format], formats[format], None, to, public_cc)   
  File "/home/oforge/code/optaros-oforge/trunk/oforge/trac-hacks/announcerplugin/announcerplugin/distributors/email_distributor.py", line 236, in _do_send     output = formatter.format(transport, event.realm, format, event)   
  File "/home/oforge/code/optaros-oforge/trunk/oforge/trac-hacks/announcerplugin/announcerplugin/formatters/ticket_email.py", line 88, in format     return self._format_html(event)   
  File "/home/oforge/code/optaros-oforge/trunk/oforge/trac-hacks/announcerplugin/announcerplugin/formatters/ticket_email.py", line 156, in _format_html     if ('\n' in new_value) or ('\n' in old_value): 
  TypeError: argument of type 'NoneType' is not iterable

[anonymous]

This was a problem with another plugin.