Protect against work conditional crash

Change-Id: Iba6e7281c622e3ba34fa6bd4672b2380b0329808
Fixes: 30014085
diff --git a/src/com/android/settings/dashboard/conditional/WorkModeCondition.java b/src/com/android/settings/dashboard/conditional/WorkModeCondition.java
index 3d9958b..7924eef 100644
--- a/src/com/android/settings/dashboard/conditional/WorkModeCondition.java
+++ b/src/com/android/settings/dashboard/conditional/WorkModeCondition.java
@@ -90,7 +90,9 @@
     @Override
     public void onActionClick(int index) {
         if (index == 0) {
-            mUm.trySetQuietModeDisabled(mUserHandle.getIdentifier(), null);
+            if (mUserHandle != null) {
+                mUm.trySetQuietModeDisabled(mUserHandle.getIdentifier(), null);
+            }
             setActive(false);
         } else {
             throw new IllegalArgumentException("Unexpected index " + index);