[hotfix] ignore if student email address field value is None (#11116)
[hotfix] ignore if student email address field value is None (#11116)


geekroot/erpnext,gsnbng/erpnext,indictranstech/erpnext,indictranstech/erpnext,geekroot/erpnext,gsnbng/erpnext,geekroot/erpnext,gsnbng/erpnext,indictranstech/erpnext,geekroot/erpnext,gsnbng/erpnext,indictranstech/erpnext