Fix a bug can be occurred when instance returns nil

[Kuniwak]

I got the following error message (full error message) when executing kitchen list:

$ kitchen list
>>>>>> ------Exception-------
>>>>>> Class: Kitchen::ClientError
>>>>>> Message: Could not load the 'vagrant' driver from the load path. Please ensure that your driver is installed as a gem or included in your Gemfile if using Bundler.
>>>>>> ----------------------
>>>>>> Please see .kitchen/logs/kitchen.log for more details
>>>>>> Also try running `kitchen diagnose --all` for configuration

This message said that "kitchen-vagrant was not installed," but kitchen-vagrant was listed by bundle list and require("kitchen/driver/vagrant.rb") did not raise LoadError.

I think this problem is caused by e788314. After this commit, the error undefined method `name' for nil:NilClass can be occurred when instance returns nil, because instance.name is accessed before nil check for instance.

[cheeseplus]

Thanks for the catch and the added test, I was moving things around for the style checker but I can see how that would have broken it.

[Kuniwak]

Thank you for the quick response!

[cheeseplus]

As soon as I saw the code and your explanation I realized that while it passed the tests, it's only because we weren't testing for that specific condition. I'll get a 1.02 release out ASAP.

[cheeseplus]

1.0.2 is released and thanks again @Kuniwak