Check availability.
		
		:param resort.engine.execution.Context context:
		   Current execution context.
		:rtype:
		   bool
		:return:
		   Availability value.

def available(self, context):
	
		"""
		Check availability.
		
		:param resort.engine.execution.Context context:
		   Current execution context.
		:rtype:
		   bool
		:return:
		   Availability value.
		"""
		if self.__available is None:
			state = self.__inst.state(context)
			self.__available = state is not None and state != "not_created"
		return self.__available