Fix loginInit to avoid infinite loop in client

[SuromiDev]

Using null instead of "" fixes the issue where the user didn't get the registration/login popup due to the client expecting session and userid values in cookies to be "". If session and userid weren't created in cookies, it would attempt to connect to a nonexistent session.

[neksodebe]

Suggestion

Instead of doing value == null, do !value.

The getCookie function can also return an empty string if the cookie is there, but empty. I'm pretty sure logging out works by expiring the cookies, but I feel like checking with ! is better off doing anyways.

source here

I tested this too:

[neksodebe]

LGTM