EventDispatcher: obtain _listeners before if (#30328)

src/core/EventDispatcher.js

@@ -26,19 +26,20 @@ class EventDispatcher {
 
 	hasEventListener( type, listener ) {
 
-		if ( this._listeners === undefined ) return false;
-
 		const listeners = this._listeners;
 
+		if ( listeners === undefined ) return false;
+
 		return listeners[ type ] !== undefined && listeners[ type ].indexOf( listener ) !== - 1;
 
 	}
 
 	removeEventListener( type, listener ) {
 
-		if ( this._listeners === undefined ) return;
-
 		const listeners = this._listeners;
+
+		if ( listeners === undefined ) return;
+
 		const listenerArray = listeners[ type ];
 
 		if ( listenerArray !== undefined ) {
@@ -57,9 +58,10 @@ class EventDispatcher {
 
 	dispatchEvent( event ) {
 
-		if ( this._listeners === undefined ) return;
-
 		const listeners = this._listeners;
+
+		if ( listeners === undefined ) return;
+
 		const listenerArray = listeners[ event.type ];
 
 		if ( listenerArray !== undefined ) {