fix vendorId empty not handle correctly

EVCB_OCPP.WSServer/Jobs/ServerMessageJob.cs

@@ -210,6 +210,7 @@ public class ServerMessageJob : IJob
         if (string.IsNullOrEmpty(vid))
         {
             dataTransferRequest.vendorId = string.Empty;
+            return;
         }
         dataTransferRequest.vendorId = vid;
     }

version.txt

@@ -1 +1 @@
-Docker_v1.1.34
+Docker_v1.1.35