[FIX] mail: use nameOrDisplayName in reactions

If the name is not known, fallback to the displayName.

closes odoo/odoo#77553

X-original-commit: 50f3581df712d5f2cbb6481f7fcb8c164ebb2da2
Signed-off-by: Samuel Degueldre <sdegueldre@users.noreply.github.com>
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/static/src/models/message_reaction_group/message_reaction_group.js

@@ -76,7 +76,7 @@ function factory(dependencies) {
                 1: secondUser,
                 2: thirdUser,
             } = [
-                ...this.partners.map(partner => partner.name),
+                ...this.partners.map(partner => partner.nameOrDisplayName),
                 ...this.guests.map(guest => guest.name),
             ];
             switch (length) {