The sample server did not create a __range value when grouping by 'date' This resulted in a traceback as it is expected to at least be false. This commit computes it properly. task-3098681 closes odoo/odoo#113163 X-original-commit: cf074f1dc01da39e75aa30e4ac21eafa29d528d9 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>