Gutenboarding: handle non-alphanumeric title in domain picker

[simison]

When customer doesn't enter title at intent capture step, we don't potentially have anything for the domain picker to do the search:

Since they filled vertical, we could use that as search term to ensure we have some results:

This is a pretty minor issue, but when I enter non-ASCII symbols in the title (e.g. emoji), the domain picker gets stuck with API response Query parameter must contain alphanumeric characters:

In that case, we can also fire the query with vertical.

Action items:

• Use vertical as a fallback for domain search when the title isn't available Gutenboarding: Fall back to vertical for domain suggestion #40770
• ...or isn't alphanumeric
• If there's nothing we can use, decide what to do. We'll anyway have to randomize free URL so let's use the same mechanism here?

[ockham]

I'm not sure it makes sense to fall back to the vertical if the title contains non-alphanumeric characters -- the vertical might be user-specified, too, and thus can also contain non-alphanumeric chars 😅 How about removing the non-alphanum characters from both when looking up domain suggestions?

[ockham]

Maybe I've been misreading you -- did you mean site titles containing only non-alphanumeric characters?

[simison]

If site-title isn't alphanumeric, domains API can't return anything apparently. #40770 is sufficient enough for now. I'll mark the rest of the follow-ups as a lower priority.

[yansern]

I'd like to reserve this as one of the good first issue for @ciampo! Thanks!

[yansern]

This is fixed in #48031 and #48399.