Before this commit: When attempting to open a dynamic placeholder in email marketing, a traceback occurs. After this commit: Now the dynamic placeholder works properly. Task-3373356 closes odoo/odoo#129415 X-original-commit: bb9fb402a135baf7e7b9da9bbb40888f5323ded9 Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>