Update test coverage for nil slice change.
Update test coverage for nil slice change.

This commit updates the test coverage report in include the latest
tests for the nil slice change.

FactomProject/go-spew,dvln/go-spew,dvln/go-spew,davecgh/go-spew,davecgh/go-spew,kortschak/utter,bparees/go-spew,FactomProject/go-spew,bparees/go-spew