fix nil return on instance.get_bash_history
fix nil return on instance.get_bash_history

donkey-hotei/edurange,edurange/edurange-server,edurange/edurange-server,edurange/edurange,edurange/edurange-server,donkey-hotei/edurange,edurange/edurange,edurange/edurange-server,edurange/edurange,donkey-hotei/edurange,donkey-hotei/edurange,edurange/edurange