clear image when source status is EMPTY.
clear image when source status is EMPTY.

bjornharrtell/ol3,ahocevar/openlayers,ahocevar/openlayers,oterral/ol3,oterral/ol3,openlayers/openlayers,bjornharrtell/ol3,openlayers/openlayers,stweil/openlayers,openlayers/openlayers,stweil/openlayers,bjornharrtell/ol3,oterral/ol3,ahocevar/openlayers,stweil/openlayers