pymel_test: fix for when no PYTHONPATH env var set
pymel_test: fix for when no PYTHONPATH env var set

assumptionsoup/pymel,shrtcww/pymel,leonsooi/pymel,AtonLerin/pymel,shrtcww/pymel,juggernate/pymel,david-lassonde-adsk/pymel,assumptionsoup/pymel,david-lassonde-adsk/pymel,juggernate/pymel,leonsooi/pymel,AtonLerin/pymel