[feat] IPModule中没有IP时取本机IP；UserModule中没有当前用户时，取当前计算机名；close: https://github.com/NewLifeX/NewLife.XCode/issues/32

XCode/Model/IPModule.cs

@@ -1,5 +1,4 @@
 using System.Collections.Concurrent;
-using NewLife;
 using XCode.Configuration;
 using XCode.Membership;
 
@@ -53,6 +52,7 @@ public class IPModule : EntityModule
         var fs = GetFields(entity.GetType());
 
         var ip = ManageProvider.UserHost;
+        ip ??= NetHelper.MyIP()?.ToString();
         if (!ip.IsNullOrEmpty())
         {
             // 如果不是IPv6，去掉后面端口

XCode/Model/UserModule.cs

@@ -83,6 +83,7 @@ public class UserModule : EntityModule
         // 当前登录用户
         var prv = Provider ?? ManageProvider.Provider;
         var user = prv?.Current;
+        user ??= new User { Name = Environment.UserName };
         if (user != null)
         {
             switch (method)