Check if there is a result for given function

		:param decorated_function: called function (original)
		:param args: args with which function is called
		:param kwargs: kwargs with which function is called

		:return: None

def has(self, decorated_function, *args, **kwargs):
		""" Check if there is a result for given function

		:param decorated_function: called function (original)
		:param args: args with which function is called
		:param kwargs: kwargs with which function is called

		:return: None
		"""
		return self.get_cache(decorated_function, *args, **kwargs).has_value