Handle chef_version not be supplied
Handle chef_version not be supplied

We should continue if a version is not provided, I believe this just covered
the case where we continued if an empty version parameter was supplied.

rhass/opscode-omnitruck,chef/omnitruck,chef/opscode-omnitruck,chef/omnitruck,chef/opscode-omnitruck,juliandunn/opscode-omnitruck,juliandunn/opscode-omnitruck,chef/omnitruck,glennmatthews/opscode-omnitruck,glennmatthews/opscode-omnitruck,juliandunn/opscode-omnitruck,glennmatthews/opscode-omnitruck,rhass/opscode-omnitruck,chef/opscode-omnitruck,rhass/opscode-omnitruck