fix: Avoid setAppendWindow when the window is Infinity (#7923)

Author: avelad

lib/media/media_source_engine.js

@@ -1309,20 +1309,24 @@ shaka.media.MediaSourceEngine = class {
             null));
       }
     }
-    operations.push(this.enqueueOperation_(
-        contentType,
-        () => this.setAppendWindow_(
-            contentType, appendWindowStart, appendWindowEnd),
-        null));
-    if (this.needSplitMuxedContent_) {
+    if (appendWindowStart != 0 || appendWindowEnd != Infinity) {
       operations.push(this.enqueueOperation_(
-          ContentType.AUDIO,
+          contentType,
           () => this.setAppendWindow_(
-              ContentType.AUDIO, appendWindowStart, appendWindowEnd),
+              contentType, appendWindowStart, appendWindowEnd),
           null));
+      if (this.needSplitMuxedContent_) {
+        operations.push(this.enqueueOperation_(
+            ContentType.AUDIO,
+            () => this.setAppendWindow_(
+                ContentType.AUDIO, appendWindowStart, appendWindowEnd),
+            null));
+      }
     }
 
-    await Promise.all(operations);
+    if (operations.length) {
+      await Promise.all(operations);
+    }
   }
 
   /**