opt：绑定服务商友好提示

src/SJZY.Track.Application/Track2InterfaceRelay/Track2InterfaceRelaySubSystemContext.cs

@@ -6,6 +6,11 @@ public class Track2InterfaceRelaySubSystemContext
 
     public Track2InterfaceRelaySubSystemContext(string code)
     {
+        if (code.IsNullOrWhiteSpace())
+        {
+            throw new BusinessException(message: "请求接口通，服务商代码不能为空，请检查是否绑定服务商");
+        }
+
         Code = code;
     }