[FIX] mail: avoid crash when channels contain special characters
[FIX] mail: avoid crash when channels contain special characters

microcom/odoo,Elico-Corp/odoo_OCB,stephen144/odoo,bplancher/odoo,storm-computers/odoo,storm-computers/odoo,syci/OCB,microcom/odoo,storm-computers/odoo,stephen144/odoo,stephen144/odoo,sysadminmatmoz/OCB,optima-ict/odoo,microcom/odoo,sysadminmatmoz/OCB,bplancher/odoo,optima-ict/odoo,syci/OCB,ygol/odoo,syci/OCB,storm-computers/odoo,syci/OCB,hip-odoo/odoo,sysadminmatmoz/OCB,microcom/odoo,hip-odoo/odoo,sysadminmatmoz/OCB,ygol/odoo,stephen144/odoo,optima-ict/odoo,laslabs/odoo,dfang/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,microcom/odoo,ygol/odoo,ygol/odoo,syci/OCB,dfang/odoo,syci/OCB,Elico-Corp/odoo_OCB,dfang/odoo,dfang/odoo,dfang/odoo,ygol/odoo,optima-ict/odoo,Elico-Corp/odoo_OCB,Elico-Corp/odoo_OCB,Elico-Corp/odoo_OCB,bplancher/odoo,hip-odoo/odoo,dfang/odoo,hip-odoo/odoo,laslabs/odoo,microcom/odoo,bplancher/odoo,laslabs/odoo,bplancher/odoo,laslabs/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,optima-ict/odoo,stephen144/odoo,storm-computers/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,sysadminmatmoz/OCB,ygol/odoo,optima-ict/odoo,ygol/odoo,stephen144/odoo,storm-computers/odoo,laslabs/odoo