[meta] reflect_constant_array of an empty range returns const array<T,0>

[hanickadot]

Marek Poláček asked in SG7 Mattermost if it should return const or not, I think for consistency it should be. If others agree this is PR fixing it.

(attempt number two for pr #8361, as I didn't notice I'm targetting not the main branch, sorry)
#8361 (comment)

[jwakely]

LWG discussed this in telecon and agreed with the change. https://eel.is/c++draft/temp.param#13.sentence-1 says the object has a const type.

[jensmaurer]

@hanickadot You have admin rights for the org, and that gives you admin rights on every repository.

However, the textual contents of the C++ standard is the responsibility of the project editor. In his sole discretion, he has designated some individuals as co-editors (Jonathan and myself, I believe), and we've arranged for suitable two-manperson rules for committing changes to the working draft.

I am not aware that you have become co-editor (if so, please speak up), so I would ask you to refrain from merging anything at all into the working draft. Feel free to assign pull request to Thomas if you believe they're ready for merge, though.

@tkoeppe , FYI.

[hanickadot]

Ah, sorry, I forgot about the two person rule.

[tkoeppe]

Thank you, Jens! Indeed, @hanickadot, please don't commit anything to the main branch. I think this one is fine, but only the IS editors should commit here. Thanks!