fix: do not throw on removeListener without listener (#15224)

Co-authored-by: Andrey Lushnikov <aslushnikov@gmail.com>

packages/playwright-core/src/client/joiningEventEmitter.ts

@@ -119,7 +119,8 @@ export class JoiningEventEmitter implements EventEmitter {
   }
 
   private _wrapper(listener: (...args: any[]) => void) {
-    return (listener as any)[wrapperListener];
+    // Fallback to original listener if not wrapped to ensure backwards compatibility Node.js's event emitter
+    return (listener as any)[wrapperListener] ?? listener;
   }
 
   private _original(wrapper: Function): Function {

tests/page/page-event-pageerror.spec.ts

@@ -128,3 +128,7 @@ it('should handle window', async ({ page, browserName, isElectron }) => {
   ]);
   expect(error.message).toBe(browserName === 'chromium' ? 'Window' : '[object Window]');
 });
+
+it('should remove a listener of a non-existing event handler', async ({ page }) => {
+  page.removeListener('pageerror', () => {});
+});