EVWidgets: Fix another NPE.

Change-Id: I8479991ddb9bb320fd46719ccf6cc18c94848dff
diff --git a/src/com/evervolv/widgets/AutoRotateWidgetProvider.java b/src/com/evervolv/widgets/AutoRotateWidgetProvider.java
index 2d63ab0..34279e7 100644
--- a/src/com/evervolv/widgets/AutoRotateWidgetProvider.java
+++ b/src/com/evervolv/widgets/AutoRotateWidgetProvider.java
@@ -68,7 +68,9 @@
                 ".AutoRotateWidgetProvider"),
                 PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager
                 .DONT_KILL_APP);
-        mObserver.unobserve();
+        if (mObserver != null) {
+            mObserver.unobserve();
+        }
     }
 
     @Override