Traceback (most recent call last):
  File "/srv/www/users/ture/photos/show.cgi", line 176, in <module>
    main(fields)
  File "/srv/www/users/ture/photos/show.cgi", line 82, in main
    return showphoto(fields)
  File "/srv/www/users/ture/photos/show.cgi", line 131, in showphoto
    page(roll, frame, size)
  File "/srv/www/users/ture/photos/show.cgi", line 160, in page
    strip.feed(com)
UnboundLocalError: local variable 'com' referenced before assignment