Fixes bindings assuming that GError is always set on error: https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/809#note_957493 https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/809#note_957494 https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/809#note_957498 Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1204>