error launching firewall tears the firewall down during restarts

this is the error. nasty side effects of this bug: no log is outputted, and fw is teared down during a hard restart.

bitmask-root: ERROR: could not start firewall
Traceback (most recent call last):
  File "/usr/sbin/bitmask-root", line 844, in main
    firewall_start(args)
  File "/usr/sbin/bitmask-root", line 733, in firewall_start
    default_device = get_default_device()
  File "/usr/sbin/bitmask-root", line 617, in get_default_device
    if match.groups():
AttributeError: 'NoneType' object has no attribute 'groups'

(from redmine: created on 2014-06-02, closed on 2014-06-25)