(temporarily) remove NULLpointer region InputTest

references should never be null, actuall code does not compile under clang 3.6 that enforces that
please review
clang-modernized

Conflicts:
	src/main/engine/Input.cpp
	src/test/testeverything/engine/InputTest.cpp
Revert "(temporarily) remove NULLpointer region InputTest"

This reverts commit c3307fe8ea91a374dd498ecf9b98e8f2e73bffe1.