When --adjust-time is used, if there is no DateTime metadata, at least adjust the time to match that of the input file.
When --adjust-time is used, if there is no DateTime metadata, at least
adjust the time to match that of the input file.


git-svn-id: c3edda122e248ef33995da003806c930f62b9468@503 31904243-a364-42ac-a3db-9305396518ba

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