Click on Logo/Title without Github-Repository: "None"

[sebastian-marinescu]

Hi @squidfunk, first of all: Very good job! I like your theme very much.

I'm writing a manual right now and tried mkDocs with your theme.
It works good, but I had some unexpected behavior:

When not provided with a repo_url, the logo/title are linked to literally: "None".
My expectation is, that it links to the root: "/".

What do you think about this?
Kind regards, Sebastian

[squidfunk]

Good idea, haven't thought about the non-repo case yet, as I only use it for my coding projects ;-) I think from a semantic aspect your idea is great, so I will provide a fix for master and pack it into 0.1.3.

[sebastian-marinescu]

Very nice, you also fixed the JS-error by this 👍 Thanks!