matrix tests: Remove Null<>s and null values.
matrix tests: Remove Null<>s and null values.

I've introduced them initially as a workaround for the "default value"
limitation of Matrix. As it is now gone, we can actually remove those
ugly null values.

Signed-off-by: aszlig <ee1aa092358634f9c53f01b5a783726c9e21b35a@redmoonstudios.org>

aszlig/hase