The location template tag should probably return None

[danielquinn]

Currently, if location() fails to find anything, it returns

<i>unknown</i>

Which is problematic on two fronts:

1. The <i> tag has been deprecated for a while in favour of <em>.

2. It limits the user's ability to control the output. Most filters return None if nothing is available because it allows you to do stuff like this:

   {{ session.ip|locaiton|default_if_none:'Nothing found' }}

For that matter, the device template tag has similar behaviour.

I can offer a pull request if you agree with this assessment. I just didn't want to write one if you wouldn't want to use it.

[Bouke]

Seems like a valid change request, I'll welcome the PR.

[Bouke]

Fixed in adbcd55.