force email to be either empty string or valid email, prevent the None object
force email to be either empty string or valid email, prevent the None object

Taybo/dzlibs,Reddine/dzlibs,01walid/dzlibs,Taybo/dzlibs,Reddine/dzlibs,benyassine/dzlibs,Taybo/dzlibs,benyassine/dzlibs,Reddine/dzlibs,abougouffa/dzlibs,breda/dzlibs,benyassine/dzlibs,01walid/dzlibs,abougouffa/dzlibs,breda/dzlibs,abougouffa/dzlibs,01walid/dzlibs,benyassine/dzlibs,breda/dzlibs