Merge pull request #12 from AnonymousDotNet/lida_dev

fix: phone is empty judgment

Author: Oceania2018

src/Infrastructure/BotSharp.Core/Users/Services/UserService.cs

@@ -58,7 +58,7 @@ public async Task<User> CreateUser(User user)
 
         record = user;
         record.Email = user.Email?.ToLower();
-        if (user.Phone != null)
+        if (!string.IsNullOrWhiteSpace(user.Phone))
         {
             record.Phone = "+" + Regex.Match(user.Phone, @"\d+").Value;
         }