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gstquery: handle failure to get ID value from structure

Joseph Newman requested to merge jn/gstreamer:fix-query-parse-context-type into master

gst_structure_id_get_value() will return NULL if it can't find the given field. This will cause g_value_get_string() to dereference a NULL pointer if glib was compiled with G_DISABLE_CHECKS.

FALSE should also be returned in this case to indicate a parsing failure and handled as appropriate by callers.

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