Crash due to missing MHOD_ID_PATH

For quite a while now, gtkpod has crashed when trying to add files to my
iPod (80GB video).  I finally made time to debug it (using the latest git
trees), and traced it to a NULL pointer dereference in write_rths().  path
was NULL, due to track->ipod_path being NULL.  This was due to one of the
tracks being duplicated, with the duplicate entry having no MHOD_ID_PATH. 

Is there any known bug in libgpod (current or former versions) that would
explain the database getting into this state?  I hacked up the code enough
to be able to delete the bad file and continue, but is there anything that
could be done to make libgpod handle such corruption more gracefully?

-Scott

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