Added a null in Settings

added a null check for actionBar in onCreate() as it is null on my
tablet (3.1)

Change-Id: I13cac0a7b4c4dc076cc0400c73a4f07fd25fb8f5
Signed-off-by: Ricky Barrette <rickbarrette@gmail.com>

ExaltedDice/src/com/TwentyCode/android/ExaltedDice/Settings.java

@@ -84,7 +84,8 @@ public class Settings extends PreferenceActivity implements OnPreferenceClickLis
 			 */
 			if(Integer.valueOf(android.os.Build.VERSION.SDK) > 11){
 				ActionBar actionBar = getActionBar();
-				actionBar.setDisplayHomeAsUpEnabled(true);
+				if(actionBar != null)
+					actionBar.setDisplayHomeAsUpEnabled(true);
 			}
 			
 			super.onCreate(savedInstanceState);