[IMP] corelib events: on() should throw error when func is not a Function
[IMP] corelib events: on() should throw error when func is not a Function

gisce/openerp-web,MarkusTeufelberger/openerp-web,splbio/openerp-web,MarkusTeufelberger/openerp-web,gisce/openerp-web,gisce/openerp-web,splbio/openerp-web,splbio/openerp-web,MarkusTeufelberger/openerp-web