Add NPE check for prediction controller

Bug: 159835714
Test: Manual
Change-Id: I9cc03f6491f4e14462be6c01edf3ed4ca1d82136
diff --git a/quickstep/src/com/android/quickstep/util/QuickstepOnboardingPrefs.java b/quickstep/src/com/android/quickstep/util/QuickstepOnboardingPrefs.java
index 0fdc684..9ed2bbe 100644
--- a/quickstep/src/com/android/quickstep/util/QuickstepOnboardingPrefs.java
+++ b/quickstep/src/com/android/quickstep/util/QuickstepOnboardingPrefs.java
@@ -101,7 +101,8 @@
             });
         }
 
-        if (!hasReachedMaxCount(HOTSEAT_DISCOVERY_TIP_COUNT)) {
+        if (FeatureFlags.ENABLE_HYBRID_HOTSEAT.get() && !hasReachedMaxCount(
+                HOTSEAT_DISCOVERY_TIP_COUNT)) {
             stateManager.addStateListener(new StateListener<LauncherState>() {
                 boolean mFromAllApps = false;