Merge remote-tracking branch 'magento-mpi/MC-22153' into MPI-PR-2019-10-31

Author: arnobsh

lib/web/fotorama/fotorama.js

@@ -434,6 +434,9 @@ fotoramaVersion = '4.6.4';
             return (this.prefix === '') ? el.requestFullScreen() : el[this.prefix + 'RequestFullScreen']();
         };
         fullScreenApi.cancel = function (el) {
+            if (!this.is()) {
+                return false;
+            }
             return (this.prefix === '') ? document.cancelFullScreen() : document[this.prefix + 'CancelFullScreen']();
         };
     }