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v4l2: if no element just log error without bus message

Víctor Manuel Jáquez Leal requested to merge vjaquez/gst-plugins-good:v4l2-open-probe into master

gst_v4l2_open() is called by gst_v4l2_device_provider_probe_device(), where the GstV4l2Object is created without an associated GstElement.

If gst_v4l2_open() fails, it raises a bus message, but without an element, a precondition check fails on gst_element_message_full_with_details() generating a crash if running with fatal-warnings debug mode.

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