[CVP] Additional check for empty salt response

Change-Id: I2f12040208aae8c52370665b43825d10f6eff32e
Related-PROD: PROD-30658
(cherry picked from commit b4d88023c67a477b89f52e64a9e9fddd09203261)
diff --git a/test_set/cvp-sanity/utils/__init__.py b/test_set/cvp-sanity/utils/__init__.py
index 06329fa..482ab59 100644
--- a/test_set/cvp-sanity/utils/__init__.py
+++ b/test_set/cvp-sanity/utils/__init__.py
@@ -79,7 +79,7 @@
                 continue
             response = request.json()['return'][0]
             result = {key: response[key] for key in response if key not in self.skipped_nodes}
-            if check_status and False in result.values():
+            if check_status and (False in result.values() or not result):
                 logging.warning("One or several nodes are not responding. Output {}".format(json.dumps(result, indent=4)))
                 continue
             break