[FIX] mail: followers computation: working on newId records can lead to issues when trying to compute followers.
[FIX] mail: followers computation: working on newId records
can lead to issues when trying to compute followers.

This case appears in the onchange mechanism. Indeed it may
manipulate temporary and/or new records, not having an
ID. In this case the computation of followers is not
necessary anymore.

mkieszek/odoo,tvtsoft/odoo8,Elico-Corp/odoo_OCB,dfang/odoo,bplancher/odoo,mkieszek/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo,microcom/odoo,dfang/odoo,Elico-Corp/odoo_OCB,optima-ict/odoo,stephen144/odoo,microcom/odoo,storm-computers/odoo,dfang/odoo,laslabs/odoo,hip-odoo/odoo,bplancher/odoo,syci/OCB,hip-odoo/odoo,dfang/odoo,bplancher/odoo,microcom/odoo,mkieszek/odoo,stephen144/odoo,hip-odoo/odoo,ygol/odoo,mkieszek/odoo,tvtsoft/odoo8,ygol/odoo,syci/OCB,Elico-Corp/odoo_OCB,laslabs/odoo,tvtsoft/odoo8,storm-computers/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,bplancher/odoo,hip-odoo/odoo,microcom/odoo,sysadminmatmoz/OCB,storm-computers/odoo,syci/OCB,mkieszek/odoo,dfang/odoo,syci/OCB,tvtsoft/odoo8,dfang/odoo,storm-computers/odoo,optima-ict/odoo,syci/OCB,sysadminmatmoz/OCB,laslabs/odoo,optima-ict/odoo,laslabs/odoo,mkieszek/odoo,bplancher/odoo,sysadminmatmoz/OCB,sysadminmatmoz/OCB,storm-computers/odoo,syci/OCB,Elico-Corp/odoo_OCB,sysadminmatmoz/OCB,ygol/odoo,sysadminmatmoz/OCB,stephen144/odoo,tvtsoft/odoo8,optima-ict/odoo,hip-odoo/odoo,stephen144/odoo,microcom/odoo,storm-computers/odoo,ygol/odoo,laslabs/odoo,stephen144/odoo,microcom/odoo,Elico-Corp/odoo_OCB,sysadminmatmoz/OCB,ygol/odoo,optima-ict/odoo,tvtsoft/odoo8,optima-ict/odoo,bplancher/odoo,stephen144/odoo