修复音效播放器，在资源还未加载完就释放，导致音效播放器报错问题

assets/core/common/audio/AudioEffectPool.ts

@@ -56,16 +56,6 @@ export class AudioEffectPool {
         return new Promise(async (resolve, reject) => {
             if (!this.switch) return resolve(-1);
 
-            let aeid = this.getAeId();
-            let key: string;
-            if (url instanceof AudioClip) {
-                key = url.uuid;
-            }
-            else {
-                key = `${bundleName}_${url}`;
-            }
-            key += "_" + aeid;
-
             // 创建音效资源
             let clip: AudioClip;
             if (url instanceof AudioClip) {
@@ -79,6 +69,22 @@ export class AudioEffectPool {
                 }
             }
 
+            // 资源已被释放
+            if (!clip.isValid) {
+                resolve(-1);
+                return;
+            }
+
+            let aeid = this.getAeId();
+            let key: string;
+            if (url instanceof AudioClip) {
+                key = url.uuid;
+            }
+            else {
+                key = `${bundleName}_${url}`;
+            }
+            key += "_" + aeid;
+
             // 获取音效果播放器播放音乐
             let ae: AudioEffect;
             let node: Node = null!;