We frequently get emails from roundup about broken pipes in the ExportCSVAction, such as

Traceback (most recent call last):

  File "/home/roundup/roundup-production//lib/python2.4/site-packages/roundup/cgi/client.py", line 265, in inner_main
    html = self.handle_action()

  File "/home/roundup/roundup-production//lib/python2.4/site-packages/roundup/cgi/client.py", line 841, in handle_action
    return action_klass(self).execute()

  File "/home/roundup/roundup-production//lib/python2.4/site-packages/roundup/cgi/actions.py", line 39, in execute
    return self.handle()

  File "/home/roundup/roundup-production//lib/python2.4/site-packages/roundup/cgi/actions.py", line 994, in handle
    writer.writerow([str(klass.get(itemid, col)) for col in columns])

  File "socket.py", line 248, in write
    self.flush()

  File "socket.py", line 235, in flush
    self._sock.sendall(buffer)

error: (32, 'Broken pipe')

The attached patch prevents these errors, ignoring them the same way other write failures to the socket get ignored.