videocrop: add tests to determine if width and height caps hold range value before getting image details
videocrop: add tests to determine if width and height caps hold range value before getting image details

This check is necessary because gst_video_crop_get_image_details_from_structure()
can't be performed when caps contain range value.

matsu/gst-plugins-good,matsu/gst-plugins-good,matsu/gst-plugins-good,matsu/gst-plugins-good