Before this commit: When having a checked checklist and clicking on the `strikethrough` gives traceback. After this commit: No traceback is being generated. Task-2833325 closes odoo/odoo#91114 X-original-commit: 491a79f6f8f734990a2ece3fd1b3f90d09a55c85 Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>