Also ignore 0x0 sizes in the fallback case and assume the size can be anything between 1x1 and MAXxMAX. This fixes the case where a width=0, height=0 caps are created. Whith this patch the caps will contain width=[1,MAX], height=[1,MAX]. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1396>