if ID provider has no .bit domain, direct users to signing address

[bvcxza]

Hi @canewsin, Could you integrate zeronet-conservancy/issues/301 to this repo?

I tried to fork this repo to make a PR with a cherry pick of zeronet-conservancy/pull/304 but github doesn't allow to have 2 forks of same origin repo.

Commits:
11010c4f0dd869dd8fd65ee5e8fad4811b19db90
7ddccddb2171b31d87b7c770e94a030a5d609494