Bug fix: broken/nonexistant textures might not have a valid spec at all, and therefore could core dump inside the per-file stats.  Handle this  gracefully.
Bug fix: broken/nonexistant textures might not have a valid spec at all,
and therefore could core dump inside the per-file stats.  Handle this 
gracefully.


git-svn-id: c3edda122e248ef33995da003806c930f62b9468@576 31904243-a364-42ac-a3db-9305396518ba

sambler/oiio,micler/oiio,scott-wilson/oiio,mcanthony/oiio,mcanthony/oiio,jeremyselan/oiio,sambler/oiio,cwilling/oiio,bdeluca/oiio,YangYangTL/oiio,bdeluca/oiio,bdeluca/oiio,cwilling/oiio,YangYangTL/oiio,YangYangTL/oiio,scott-wilson/oiio,OpenImageIO/oiio,mcanthony/oiio,micler/oiio,mcanthony/oiio,micler/oiio,bdeluca/oiio,scott-wilson/oiio,jeremyselan/oiio,cwilling/oiio,sambler/oiio,lgritz/oiio,scott-wilson/oiio,jeremyselan/oiio,OpenImageIO/oiio,YangYangTL/oiio,cwilling/oiio,lgritz/oiio,OpenImageIO/oiio,sambler/oiio,OpenImageIO/oiio,lgritz/oiio,lgritz/oiio,micler/oiio