gst/gsturi.c: Don't assert/crash here if a uri handler doesn't return any supported...

gst/gsturi.c: Don't assert/crash here if a uri handler doesn't return any supported protocols. The list of protocols ...

Original commit message from CVS:
* gst/gsturi.c: (search_by_entry):
Don't assert/crash here if a uri handler doesn't return any
supported protocols. The list of protocols could be generated
dynamically at runtime or at plugin registration, and an error
in the underlying library shouldn't be fatal (#353301).