Disabling Variables statistics enabled results in NaN variables

[paulusv]

In the general settings of Mica, if you disable variables statistics enabled the frontpage will show NaN for variables count:

I was also able to reproduce this on the demo site.
I'm not sure if this is intended behaviour, but if so I think the tooltip should be updated.
Now it implies it will only have effect in the administrative side of Mica, not on the frontpage.