Refactor load_next_schedule() error handle
Refactor load_next_schedule() error handle

Using try...except to handle when load schedule failed

Billy4195/electronic-blackboard,stvreumi/electronic-blackboard,SWLBot/electronic-blackboard,SWLBot/electronic-blackboard,SWLBot/electronic-blackboard,Billy4195/electronic-blackboard,Billy4195/electronic-blackboard,SWLBot/electronic-blackboard,stvreumi/electronic-blackboard,stvreumi/electronic-blackboard,Billy4195/electronic-blackboard,stvreumi/electronic-blackboard