build fix

src/Approve.Checker/App.cs

@@ -23,11 +23,6 @@ public class App : IApp
             ServerCertificateCustomValidationCallback = (_, _, _, _) => true
         };
         _settings = new Settings();
-        if (string.IsNullOrEmpty(_settings.GitlabUrl))
-        {
-            Console.WriteLine("CI_SERVER_URL is not defined.");
-            return;
-        }
         _client = new GitLabClient(_settings.GitlabUrl, _settings.GitlabToken, httpHandler);
         _customClient = new GitlabCustomClient(_settings.GitlabUrl, _settings.GitlabToken, httpHandler);
     }

src/Approve.Checker/Gitlab/ApproversDto.cs

@@ -9,5 +9,5 @@ namespace Approve.Checker.Gitlab;
 public class ApproversDto
 {
     public int CountApprovers { get; set; } = 1;
-    public List<string> Users { get; set; }
+    public List<string> Users { get; set; } = new();
 }