U4-9659 Javascript error when inserting an image into the rich text editor from the media picker

src/Umbraco.Web.UI.Client/src/common/directives/components/imaging/umbimagegravity.directive.js

@@ -108,8 +108,10 @@ angular.module("umbraco.directives")
 					$image.load(function(){
 						$timeout(function(){
 							setDimensions();
-							scope.loaded = true;
-							scope.onImageLoaded();
+                            scope.loaded = true;
+                            if (scope.onImageLoaded) {
+                                scope.onImageLoaded();    
+                            }
 						});
 					});