resolve merge conflicts of 5c229885fce2c6b0d925c4146892db4139dd3657 to ub-launcher3-qt-future-dev

Bug: None
Test: I solemnly swear I tested this conflict resolution.

Change-Id: I41247ff46308b72158731e4a47466533d42e67c6
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java
index c17b2fe..0a45cca 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java
@@ -380,6 +380,10 @@
             TaskView runningTaskView = recentsView.getRunningTaskView();
             if (runningTaskView == null) {
                 runningTaskView = recentsView.getCurrentPageTaskView();
+                if (runningTaskView == null) {
+                    // There are no task views in LockTask mode when Overview is enabled.
+                    return;
+                }
             }
             TimeInterpolator oldInterpolator = translateY.getInterpolator();
             Rect fallbackInsets = launcher.getDeviceProfile().getInsets();