add error message for missing test
add error message for missing test

problem: old error message was just an undefined item error
solution: check that test exists first, give error that leads user towards solution

eburkitt/zproject,twhittock/zproject,keent/zproject,paddor/zproject,hintjens/zproject,paddor/zproject,twhittock/zproject,zeromq/zproject,eburkitt/zproject,taotetek/zproject,taotetek/zproject,keent/zproject,zeromq/zproject,zeromq/zproject,hintjens/zproject,paddor/zproject,taotetek/zproject