Update BlazorAppsettingsFilePortChangeForSeparatedAuthServersStep.cs

framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/ProjectBuilding/Templates/App/BlazorAppsettingsFilePortChangeForSeparatedAuthServersStep.cs

@@ -14,6 +14,11 @@ public class BlazorAppsettingsFilePortChangeForSeparatedAuthServersStep : Projec
                 StringComparison.InvariantCultureIgnoreCase)
         );
 
+        if (appsettingsFile == null)
+        {
+            return;
+        }
+        
         appsettingsFile.NormalizeLineEndings();
         var lines = appsettingsFile.GetLines();