BUG: setting minimum_motion_frame to 1 stops image output until restart

I am experimenting with settings to see the effect. I had minimum_motion_frame set as 2, and output was as expected, both movie and image files. Then I changed the value to 1, using the control interface, and on the next event there were no images written. "on_event_end" ran with an event number, but there were no images for that event, only a movie file. After a restart, it was working as expected again

Environment

Motion version:	3.2.12
ffmpeg version:
Shared libraries:	ffmpeg, mysql, postgresql
Server OS:

-- WilliamPhelps - 28 Sep 2013

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