Add missing django-allauth empty View

[tanoabeleyra]

Hello,

A NoReverseMatch exception is thrown during signup when using django-allauth and ACCOUNT_EMAIL_VERIFICATION is set to 'mandatory'.
This happen because django-allouth tries to reverse a missing route: https://github.com/pennersr/django-allauth/blob/master/allauth/account/adapter.py#L458.

I added an empty view to avoid this.
The view was already there some time ago and removed on this commit: 0fc4d56#diff-c6d8840dbabc2fb43a1d18876004f17a. Please let me know if it was any reason for this, I can't see any.

This can also be avoided by importing django-allauth urls but I would prefer not to. Also, the documentation doesn't say you should.

[coveralls]

Coverage remained the same at 96.365% when pulling c5970df on tanoabeleyra:master into 479a40d on Tivix:master.

[tanoabeleyra]

Given the lack of response here (and most of the PR/issues) I'll just make a fork, thanks anyway.