gst/gstevent.c: Sometimes a tag event arrives but the structure does not contain a valid tag list. Adding a safety ch...

Original commit message from CVS:
2004-02-10  Julien MOUTTE <julien@moutte.net>

* gst/gstevent.c: (_gst_event_free): Sometimes a tag event arrives but
the structure does not contain a valid tag list. Adding a safety check
to remove a noisy warning in that case.