feed-pqm error at end of approved proposals

[Jonathan Riddell]

feed-pqm crashes with an error when at the end of the list of approved proposals

Traceback (most recent call last):
  File "/usr/bin/feed-pqm", line 257, in <module>
    sys.exit(main(sys.argv))
  File "/usr/bin/feed-pqm", line 253, in main
    print "No remaining merge proposals matching status %r?" % find_status
NameError: global name 'find_status' is not defined