android:ui crash on longpress of empty tile

null pointer check because of resolveInfoForPosition is nullable

Test: manual
Bug: 62441400
Change-Id: I0a720f30f9e76d9bedf6175a6ba951bcf1707c47

core/java/com/android/internal/app/ChooserActivity.java

@@ -389,6 +389,10 @@ public class ChooserActivity extends ResolverActivity {
 
     @Override
     public void showTargetDetails(ResolveInfo ri) {
+        if (ri == null) {
+            return;
+        }
+
         ComponentName name = ri.activityInfo.getComponentName();
         boolean pinned = mPinnedSharedPrefs.getBoolean(name.flattenToString(), false);
         ResolverTargetActionsDialogFragment f =