Fix google_oauth2 hd check: fix hd option fetching

[winebarrel]

Error occurs when setting as follows:

    google_oauth2:
      client_id: '<%= ENV["GOOGLE_CLIENT_ID"] %>'
      client_secret: '<%= ENV["GOOGLE_CLIENT_SECRET"] %>'
      options:
        #hd: '<%= ENV["GOOGLE_HOSTED_DOMAIN"] %>'

NoMethodError (undefined method `hd' for nil:NilClass):
kuroko2 (0.4.2) app/controllers/kuroko2/sessions_controller.rb:38:in `valid_google_hosted_domain?'

Please merge if no problem 🙏

[eisuke]

I think that there is no case without G suite hosted domain. How about making it required? (
Kuroko2 raises error with messages when there is no hd option)

[winebarrel]

How about making it required?

hd option is unnecessary when using normal gmail (non-G suite).
I think some users do not use G suite.

[eisuke]

I think some users do not use G suite.

Ah, Make sense...

[eisuke]

Please fix failure specs.

[eisuke]

LGTM. Thanks!