Fix NPE.

Bug: 7034583
Change-Id: Ie6b436492d12b0dd6bbe1c25d9b7ac35b74095d3

Author: Jeff Brown

services/java/com/android/server/TwilightService.java

@@ -50,7 +50,7 @@
 public final class TwilightService {
     private static final String TAG = "TwilightService";
 
-    private static final boolean DEBUG = true;
+    private static final boolean DEBUG = false;
 
     private static final String ACTION_UPDATE_TWILIGHT_STATE =
             "com.android.server.action.UPDATE_TWILIGHT_STATE";
@@ -463,6 +463,11 @@ private void setLocation(Location location) {
         }
 
         private void updateTwilightState() {
+            if (mLocation == null) {
+                setTwilightState(null);
+                return;
+            }
+
             final long now = System.currentTimeMillis();
 
             // calculate yesterday's twilight