Merge "Null-check tooltip view to avoid race condition crash." into sc-dev am: 262d5493ed

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15128610

Change-Id: I84b953a55427b6997ce84e1908a2fba5956f3cb8

packages/SystemUI/src/com/android/systemui/volume/VolumeDialogImpl.java

@@ -1127,7 +1127,12 @@ public class VolumeDialogImpl implements VolumeDialog,
                     .alpha(0.f)
                     .setStartDelay(0)
                     .setDuration(mDialogHideAnimationDurationMs)
-                    .withEndAction(() -> mODICaptionsTooltipView.setVisibility(INVISIBLE))
+                    .withEndAction(() -> {
+                        // It might have been nulled out by tryToRemoveCaptionsTooltip.
+                        if (mODICaptionsTooltipView != null) {
+                            mODICaptionsTooltipView.setVisibility(INVISIBLE);
+                        }
+                    })
                     .start();
         }
     }