Fix exception on path.resolve when config file is not specified.
Fix exception on path.resolve when config file is not specified.

Addepar/testem,paulot/testem,testem/testem,johanneswuerbach/testem,testem/testem,fotinakis/testem,johanneswuerbach/testem,testem/testem,bradleylandis/testem,bradleylandis/testem,paulot/testem,johanneswuerbach/testem,fotinakis/testem,fotinakis/testem,paulot/testem,Addepar/testem,Addepar/testem,Addepar/testem,bradleylandis/testem