make test_nil_is_an_object true

* nil is an object
[#48449041]
Fix failing test for assert

* Found exception for calling method on nil was
  NoMethodError

* Messages attached to exception was undefined
  method

[#48449041]
Fix test_nil_has_a_few_methods_defined_on_it

* Learned nil has a few methods defined on it

[#48449041]