[Bluetooth] Make error message more precise

[Verification] Code compiles

Change-Id: I252f82a0aede03297b852b9ad1e17bf5c71ec1b6
Signed-off-by: Pawel Wasowski <p.wasowski2@samsung.com>

diff --git a/src/bluetooth/bluetooth_api.js b/src/bluetooth/bluetooth_api.js
index 9766aca..152454f 100755 (executable)
--- a/src/bluetooth/bluetooth_api.js
+++ b/src/bluetooth/bluetooth_api.js
@@ -2001,7 +2001,7 @@ BluetoothGATTServerService.prototype.unregister = function() {
     if (serviceIndex === -1) {
         throw new WebAPIException(
             'AbortError',
-            'The service is not registered in the local GATT server'
+            'The service is not registered in the local GATT server or is included in another service'
         );
     }