Display Document Property Ref Concat Macro fails to render URLs

The concatenation of URLs is currently not supported by the Display Document Property Ref Concat Macro if the transcluded part is already a URL that actually links to the resource.

If the transcluded part is a URL, then the constructed part should allow to render as a new URL.

For instance:

• transcluded part: <a href="https://mycorp">https://mycorp</a>
• local part: service
• concatenated: <a href="https://mycorp/service">https://mycorp/service</a>