Dynamic typing strikes again.

Traceback (most recent call last):
  File "/usr/bin/reportbug", line 1731, in ?
    main()
  File "/usr/bin/reportbug", line 1471, in main
    listcc += ui.get_multiline('Enter any additional addresses this report should be sent to; press ENTER after each address.')
TypeError: argument to += must be iterable

BTW, for anyone who reads my blog and not Planet, this has a simple fix.