Merge branch 'master' of https://github.com/dilidili/NJU_EMS.git

Conflicts:
	nju_ems_artifact/.classpath
	nju_ems_artifact/target/classes/nju_ems_group/nju_ems_artifact/login/loginbl/LoginContraller.class
	nju_ems_artifact/target/classes/nju_ems_group/nju_ems_artifact/vo/StudentVO.class
添加了当选科学生是零的时候的异常处理
Merge branch 'master' of https://github.com/dilidili/NJU_EMS.git