Fix generic build boot sequence.

The TelephonyRegistry service crashed badly in the generic build, because
there is no system property to tell if the phone is GSM or CDMA. Adding a
simple null check solves the issue and allows the system to boot properly.

services/java/com/android/server/TelephonyRegistry.java

@@ -109,7 +109,13 @@ class TelephonyRegistry extends ITelephonyRegistry.Stub {
     // handler before they get to app code.
 
     TelephonyRegistry(Context context) {
-        CellLocation.getEmpty().fillInNotifierBundle(mCellLocation);
+        CellLocation  location = CellLocation.getEmpty();
+
+        // Note that location can be null for non-phone builds like
+        // like the generic one.
+        if (location != null) {
+            location.fillInNotifierBundle(mCellLocation);
+        }
         mContext = context;
         mBatteryStats = BatteryStatsService.getService();
     }