Added support for basehref if $siteurl is empty.

Added support for basehref if $siteurl is empty. Can you check if this works in your situation with $siteurl filled?

Tested with:
creating users, groups, permissions
deleting users, groups, permissions
activating users
login

I have closed the other requests since this one fixes them both.
https://github.com/MrJuliuss/syntara/pull/64
https://github.com/MrJuliuss/syntara/pull/67