Update external-map-map.html
Update external-map-map.html

Handle situation when user reloads external map window

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