[IMP] mail: Do not create channels or partners from an invitation on a chatter
[IMP] mail: Do not create channels or partners from an invitation on a chatter

Use case: I can create a Channel on a chatter, for example on a task
If I choose create and edit, there's another window coming where I
can set up the Channel. In this situation I can't add any members.
But then as the channel is empty and I (as the creator) am not by default
in that channel, I can't find it in my Channels in Discuss...

hip-odoo/odoo,dfang/odoo,dfang/odoo,ygol/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo,dfang/odoo,ygol/odoo,dfang/odoo,ygol/odoo,dfang/odoo,hip-odoo/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo