Use Case
--------
Have two (or more) rules with mutually exclusive domain for that can be
apply on the same event with lead_creation_basis = order
Create a registration that match one of the rule
Problem
-------
The lead for this rule is created properly but there is also
another lead with the name False - False that is created for the second
rule for which the registration does not match the filter
Solution
--------
Create a lead only when there is a non empty record set in the
registration group
closesodoo/odoo#70590
X-original-commit: 43fc8dac5e21a9aecf7b2950a6c3c77d8142ee45
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>