erp5_simulation: don't create movement whe quantity is negatif

bt5/erp5_simulation/DocumentTemplateItem/portal_components/document.erp5.QuantityDeliverySolver.py

@@ -77,7 +77,7 @@ class QuantityDeliverySolver(XMLObject):
     simulation_movement_list = self._getSimulationMovementList()
     for movement in simulation_movement_list:
       movement.edit(quantity=new_quantity, activate_kw=activate_kw)
-      if remaining_quantity:
+      if remaining_quantity > 0:
         result.append((movement, remaining_quantity))
     return result