Bugfix for #252, don't attempt to read video file if invalid or 0 frames long #275
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video.get(cv2.CAP_PROP_FRAME_COUNT) returns 0 or -1
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Raise error if video file has 0 frames or is in valid.
video.get(cv2.CAP_PROP_FRAME_COUNT) returns 0 or -1
An addition change could be implemented by calling video.setExceptionMode(True) which would raise cv2 errors if other issues arise later.
Fixes #252