fix(animations): do not throw errors when a destroyed component is animated (#23836)

PR Close #23836

packages/animations/browser/src/render/transition_animation_engine.ts

@@ -649,9 +649,12 @@ export class TransitionAnimationEngine {
 
   trigger(namespaceId: string, element: any, name: string, value: any): boolean {
     if (isElementNode(element)) {
-      this._fetchNamespace(namespaceId).trigger(element, name, value);
+      const ns = this._fetchNamespace(namespaceId);
+      if (ns) {
+        ns.trigger(element, name, value);
         return true;
       }
+    }
     return false;
   }
 

packages/animations/browser/test/render/transition_animation_engine_spec.ts

@@ -616,6 +616,13 @@ const DEFAULT_NAMESPACE_ID = 'id';
         expect(element.contains(child1)).toBe(true);
         expect(element.contains(child2)).toBe(true);
       });
+
+      it('should not throw an error if a missing namespace is used', () => {
+        const engine = makeEngine();
+        const ID = 'foo';
+        const TRIGGER = 'fooTrigger';
+        expect(() => { engine.trigger(ID, element, TRIGGER, 'something'); }).not.toThrow();
+      });
     });
   });
 })();