Don't WTF when assist structure is missing.

That could happen when app throws an exception while filling it.

Fixes: 38312929
Test: manual verification by forcing an app to throw an exception

Change-Id: I7e94e9d352c4c3fd8adf01bcf7b25f66535e070d

services/autofill/java/com/android/server/autofill/Session.java

@@ -174,13 +174,13 @@ final class Session implements RemoteFillService.FillServiceCallbacks, ViewState
         public void send(int resultCode, Bundle resultData) throws RemoteException {
             final AssistStructure structure = resultData.getParcelable(KEY_STRUCTURE);
             if (structure == null) {
-                Slog.wtf(TAG, "no assist structure");
+                Slog.e(TAG, "No assist structure - app might have crashed providing it");
                 return;
             }
 
             final Bundle receiverExtras = resultData.getBundle(KEY_RECEIVER_EXTRAS);
             if (receiverExtras == null) {
-                Slog.wtf(TAG, "No " + KEY_RECEIVER_EXTRAS + " on receiver");
+                Slog.e(TAG, "No receiver extras - app might have crashed providing it");
                 return;
             }