Fix 3534

[svartkanin]

Fixes #3534

[codefiles]

@svartkanin
With 7316b56, pressing enter when a username field was empty would act as a skip. Now with this change, it states The username you entered is invalid. This message seems wrong; no username was entered.

Also these type of git commit messages (Fix n) ruin the usability of git log and git show. Would you please use a description of the change as a git commit message? Using Fixes #n as a GitHub comment on the pull request is the convention.

[svartkanin]

Good point, I'll use more descriptive messages next time.
Regarding the change, yes that behaviour has changed. I don't think pressing enter should be equivalent to skip as skip is mostly used to skip the entire flow including sub selections.
So I think it makes sense to treat enter as the actual confirmation of whatever text is currently in the box even if it's empty.