fix: Do not make LICENSE_REQUEST_FAILED fatal if other keys are succe…

…ssful (#6457)

Fixes #3051

lib/media/drm_engine.js

@@ -1506,6 +1506,9 @@ shaka.media.DrmEngine = class {
       const req = this.playerInterface_.netEngine.request(requestType, request);
       response = await req.promise;
     } catch (error) {
+      if (this.destroyer_.destroyed()) {
+        return;
+      }
       // Request failed!
       goog.asserts.assert(error instanceof shaka.util.Error,
           'Wrong NetworkingEngine error type!');
@@ -1514,9 +1517,20 @@ shaka.media.DrmEngine = class {
           shaka.util.Error.Category.DRM,
           shaka.util.Error.Code.LICENSE_REQUEST_FAILED,
           error);
-      this.onError_(shakaErr);
-      if (metadata && metadata.updatePromise) {
-        metadata.updatePromise.reject(shakaErr);
+      if (this.activeSessions_.size == 1) {
+        this.onError_(shakaErr);
+        if (metadata && metadata.updatePromise) {
+          metadata.updatePromise.reject(shakaErr);
+        }
+      } else {
+        if (metadata && metadata.updatePromise) {
+          metadata.updatePromise.reject(shakaErr);
+        }
+        this.activeSessions_.delete(session);
+        if (this.areAllSessionsLoaded_()) {
+          this.allSessionsLoaded_.resolve();
+          this.keyStatusTimer_.tickAfter(/* seconds= */ 0.1);
+        }
       }
       return;
     }