fix: title empty if AddSegment is not called

src/OrchardCore/OrchardCore.DisplayManagement/Extensions/IHtmlContentExtensions.cs

@@ -0,0 +1,15 @@
+using System.Text.Encodings.Web;
+using Microsoft.AspNetCore.Html;
+
+
+namespace OrchardCore.DisplayManagement.Extensions;
+
+public static class IHtmlContentExtensions
+{
+  public static string GetString(this IHtmlContent content)
+  {
+    using var writer = new System.IO.StringWriter();
+    content.WriteTo(writer, HtmlEncoder.Default);
+    return writer.ToString();
+  }
+}

src/OrchardCore/OrchardCore.DisplayManagement/Title/PageTitleBuilder.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using Microsoft.AspNetCore.Html;
 using OrchardCore.DisplayManagement.Zones;
+using OrchardCore.DisplayManagement.Extensions;
 
 namespace OrchardCore.DisplayManagement.Title
 {
@@ -48,7 +49,7 @@ public IHtmlContent GenerateTitle(IHtmlContent separator)
                 return _fixedTitle;
             }
 
-            if (_title != null)
+            if (_title != null && System.String.Empty != _title.GetString())
             {
                 return _title;
             }
@@ -82,6 +83,7 @@ public IHtmlContent GenerateTitle(IHtmlContent separator)
         public void Clear()
         {
             _fixedTitle = null;
+            _title = null;
             _titleParts.Clear();
         }
     }