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gstplay: fix critical log when enable playbin3

Haihua Hu requested to merge JaredHu/gstreamer:gstplay-fix-critical-log-when-enable-playbin3 into main

when play rtsp stream with playbin3 enabled, there are some critical logs:

g_object_get_is_valid_property: object class 'GstPlayBin3' has no property named 'n-video' g_object_get_is_valid_property: object class 'GstPlayBin3' has no property named 'n-audio' g_object_get_is_valid_property: object class 'GstPlayBin3' has no property named 'n-text'

root cause is self->collection could be NULL when READY->PAUSED if the pipeline is live, then it will fallback to query playbin2's property, need check self->collection when playbin3 is enabled

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