Guess mapping only if it is None
Guess mapping only if it is None

It allows to pass {} as a mapping and guessing will not be used

loles/solar,pigmej/solar,zen/solar,Mirantis/solar,Mirantis/solar,loles/solar,openstack/solar,pigmej/solar,Mirantis/solar,Mirantis/solar,zen/solar,loles/solar,openstack/solar,pigmej/solar,loles/solar,zen/solar,openstack/solar,zen/solar