[FIX] mass_mailing: restore empty template thumbnail

The empty template had no thumbnail for the "select your template" tab.
This introduces a simple white one.

closes odoo/odoo#80622

X-original-commit: b1ac5a0167c0463d6d83bf4a8463a5e7432ebc21
Related: odoo/enterprise#22616
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>
This commit is contained in:
Antoine Guenet
2021-12-01 08:00:54 +00:00
parent 4d519e5b9c
commit 9f480ba234
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