May user-friendly link names be empty?

[Sean Conner]

It was thus said that the Great codesoap at mailbox.org once stated:
> 
> Do you have a link to an authoritative source upon which your knowledge
> on the matter is based? I wrote my initial mail on the topic, because
> I'm looking for an authoritative answer rather than an opinion.

  Let me amend my previous response---the BNF at
https://gitlab.com/gemini-specification/gemini-text/-/issues/7, as defined,
will allow the text portion of the link line to be nothing but spaces (per
the text rule).

  -spc