Fixed runtime JS error

An error occured when trying to slice data.company.overview when
overview was undefined, eg: https://www.facebook.com/ironman, it now
checks before slicing and returns "None provided" if there is no data.
Adding checks for undefined location

The Iron Man page also does not have any location data so throws a
runtime JS error, fixed this up with some checks for undefined and
default values, if it is undefined then the address section is hidden.