'learn' command throws error

[kwebster2]

@Lukeghenco
learn command throws the following error when using the IDE:

/Users/kevinwebster/.rvm/gems/ruby-2.3.1/gems/learn-test-2.4.0/lib/learn_test/strategies/mocha.rb:49:in `results': undefined method `[]' for nil:NilClass (NoMethodError)
	from /Users/kevinwebster/.rvm/gems/ruby-2.3.1/gems/learn-test-2.4.0/lib/learn_test/runner.rb:68:in `push_results'
	from /Users/kevinwebster/.rvm/gems/ruby-2.3.1/gems/learn-test-2.4.0/lib/learn_test/runner.rb:19:in `run'
	from /Users/kevinwebster/.rvm/gems/ruby-2.3.1/gems/learn-test-2.4.0/bin/learn-test:60:in `<top (required)>'
	from /Users/kevinwebster/.rvm/gems/ruby-2.3.1/bin/learn-test:22:in `load'
	from /Users/kevinwebster/.rvm/gems/ruby-2.3.1/bin/learn-test:22:in `<main>'
	from /Users/kevinwebster/.rvm/gems/ruby-2.3.1/bin/ruby_executable_hooks:15:in `eval'
	from /Users/kevinwebster/.rvm/gems/ruby-2.3.1/bin/ruby_executable_hooks:15:in `<main>'

The root cause is that mocha-multi is missing from the lab's dependencies, so the results are not being output to the .results.json file.

When running learn locally with npm installed, the learn-test mocha strategy automatically checks for the mocha-multi dependency and installs it via npm if it does not exist, so it is not an issue.

Also, as a side note, the learn-test command is not using the "test" script specified in package.json - it is instead running the command referenced in the below issue.

Similar issue and solution/explanation here:
learn-co-curriculum/quote-maker-react-lab#2