Check for mAttachInfo nullness when getting the autofillable drawable.

Test: manual verification on Caviar (automated test will be added later)
Test: CtsAutoFillServiceTestCases pass

Bug: 38341498
Fixes:  38323841

Change-Id: I15cc792de87987cc19a229c2ab2dfc317877f7ec

core/java/android/view/View.java

@@ -20506,6 +20506,9 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
      * @throws IllegalStateException if the drawable could not be found.
      */
     @Nullable private Drawable getAutofilledDrawable() {
+        if (mAttachInfo == null) {
+            return null;
+        }
         // Lazily load the isAutofilled drawable.
         if (mAttachInfo.mAutofilledDrawable == null) {
             Context rootContext = getRootView().getContext();