null error fix

Author: farajfarook

.github/workflows/cd.yaml

@@ -6,7 +6,7 @@ on:
       - main
 
 env:
-  PACKAGE_VERSION: 7.0.2
+  PACKAGE_VERSION: 7.0.3
   PACKAGE_PROJECT: https://nlib.enbiso.com
   PACKAGE_REPO: https://github.com/enbiso/Enbiso.NLib
   PACKAGE_COPYRIGHT: Copyright 2021 (c) enbiso. All rights reserved.

Enbiso.NLib.EventBus.Nats/NatsConnection.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
@@ -60,7 +61,8 @@ public void VerifyConnection()
 
             policy.Execute(() =>
             {
-                _logger.LogInformation("Connecting to {Servers}", string.Join(", ", _opts.Servers));
+                var servers = _opts.Servers ?? Array.Empty<string>();
+                _logger.LogInformation("Connecting to {Servers}", string.Join(", ", servers));
                 _connection = _factory.CreateConnection(_opts);
                 if (!IsConnected) return;
                 _logger.LogInformation("Connected to NATS");