[Bug] Invalid documentation on type parameter

[bkoelman]

Describe the bug
When a generic class contains a summary, but the type parameter is not documented, the summary text is shown for the type parameter.

To Reproduce

1. Create a new project and add the following class:

   /// <summary>
   /// A visitor for tree nodes.
   /// </summary>
   public sealed class NodeVisitor<T>
   {
   }

2. Follow the getting-started steps from the docfx documentation.

3. Open the documentation website in the browser.

   

Expected behavior
No documentation should be shown for the type parameter, because it is not documented. This worked properly in v2.74.0:

Context (please complete the following information):

• OS: Windows 11
• Docfx version: latest master (at commit 1d5e946)
• .NET version: .NET 8
• docfx.json config: default settings produced by docfx init

[filzrev]

This issue seems occurred from docfx v2.75.1

It can be fixed by adding following lines to [templates/common/ManagedReference.common.js] file. (https://github.com/dotnet/docfx/blob/main/templates/common/ManagedReference.common.js#L199-L207)

  if(vm.syntax.typeParameters) {
    vm.syntax.typeParameters.forEach(item => {
      item.description = item.description || "";
    });
  }

or explicitly assign empty string to Description property at ApiParameterBuildOutput.cs