null fix

ethereumj-core-android/src/main/java/org/ethereum/android/service/ServiceConnector.java

@@ -56,6 +56,7 @@ public class ServiceConnector {
         public void handleMessage(Message message) {
 
             boolean isClaimed = false;
+            if (message.obj != null) {
                 String identifier = ((Bundle) message.obj).getString("identifier");
                 if (identifier != null) {
 
@@ -65,6 +66,7 @@ public class ServiceConnector {
                         }
                     }
                 }
+            }
             if (!isClaimed) {
                 super.handleMessage(message);
             }