Fix, make  conditions an empty list.
@@ -148,7 +148,7 @@ class FontBakeryTest(FontbakeryCallable):
super(FontBakeryTest, self).__init__(testfunc)
self.id = id
self.name = testfunc.__name__ if name is None else name
- self.conditions = conditions
+ self.conditions = conditions or []
self.description = description
# self._arguments_setup = arguments_setup
# self._conditions_setup = conditions_setup
