Merge "Null-check AV before checking its alpha." into rvc-dev am: 1b824ba3df

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12010086

Change-Id: I041f759d7819acd53a5c06fc199d4fda042a6d2e

packages/SystemUI/src/com/android/systemui/bubbles/BubbleExpandedView.java

@@ -495,12 +495,9 @@ public class BubbleExpandedView extends LinearLayout {
         }
         final float alpha = visibility ? 1f : 0f;
 
-        if (alpha == mActivityView.getAlpha()) {
-            return;
-        }
-
         mPointerView.setAlpha(alpha);
-        if (mActivityView != null) {
+
+        if (mActivityView != null && alpha != mActivityView.getAlpha()) {
             mActivityView.setAlpha(alpha);
             mActivityView.bringToFront();
         }