Steps to follow

  - Set the thousands_sep of the current lang to an empty string or null
  - Create a report
  -> The thousand separator from the system locale will be used instead to format numbers

Solution

  Use an empty string if there is no thousands separator

opw-2507441

closes odoo/odoo#75868

Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>