[FIX] mail: prevent crash when interacting with inactive partner
[FIX] mail: prevent crash when interacting with inactive partner

when a user is disaninactivated, it makes sense to disaninactivate his/her
corresponding res_partner.  This had the unfortunate effect of changing
the result of the channel_slot call for the direct messages with this
user.  As a result, the discuss interface was not happy.  This commit
does what it needs to keep the discuss interface happy.  That's what we
want, right?

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