[FIX] base: Make sure start time is not undefined
[FIX] base: Make sure start time is not undefined

As debugging might be enabled during runtime we need to make sure that
the condition does only pass in case start time is defined
ygol/odoo,hip-odoo/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo