Entering invalid URL leads to errors

[morebrownies]

I entered a random URL http://beta.openbazaar.com/store/wolfdasjhfadsjhfasdfj and it led me to this error:

We need to handle this scenario more gracefully and display a Page not found error instead

[hoffmabc]

I turned off errors so it at least doesn't show those, but we'll need to determine what we want it to do if there's no user account? Go to the main page @morebrownies ?