def setIcon(self, icon):
        raise NotImplementedError
Validator that at least one key exists.
dataset/ETHPy150Open rwl/muntjac/muntjac/ui/tab_sheet.py/ITab.setIcon--crossover with--dataset/ETHPy150Open home-assistant/home-assistant/homeassistant/helpers/config_validation.py/has_at_least_one_key