Remove usage of undeclared variable
Remove usage of undeclared variable

Someone had forgotten to run the tests before push,
so the tests where all red and the code does not make
any sense

fixes #461

agdsn/pycroft,lukasjuhrich/pycroft,agdsn/pycroft,agdsn/pycroft,lukasjuhrich/pycroft,agdsn/pycroft,lukasjuhrich/pycroft,lukasjuhrich/pycroft,agdsn/pycroft