(temporarily) remove NULLpointer region InputTest

references should never be null, actuall code does not compile under clang 3.6 that enforces that
please review
Merge pull request #181 from breznak/fix_null_dereference_clang3.5

remove NULL pointer test (dereferencing NULL)
Merge branch 'master' of https://github.com/numenta/nupic.core into 10-google-test-rewrite