48448949 about nil.rb

What I learned. 

I used irb to help with the answers for the tests that were failing in method. 

irb(main):002:0> nil.to_s
=> ""

test_nil_has_a_few_methods_defined_on_it

I did a google search on NoMethodError to find the answer for method.

test_you_dont_get_null_pointer_errors_when_calling_methods_on_nil