Optimize the details

Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs

@@ -366,6 +366,15 @@ namespace SqlSugar
                         }
                     }
                 }
+                else 
+                {
+                    //No navigation data  set new List()
+                    foreach (var item in list)
+                    {
+                         var instance = Activator.CreateInstance(navObjectNamePropety.PropertyType, true);
+                         navObjectNamePropety.SetValue(item, instance);
+                    }
+                }
             }
         }