Multiple chassis delete breaking in between the operation.

multiple chassis delete will not complete if any one of the chassis contains node.
For example :

# ironic node-show 98a44c27-0cb5-43ea-b77f-624c75a7860d
+------------------------+--------------------------------------+
| Property | Value |
+------------------------+--------------------------------------+
| chassis_uuid | a024b04a-37fe-446e-b79d-84ed9fa049d7 |
| clean_step | {} |
| console_enabled | False |
| created_at | 2016-11-24T05:00:52+00:00 |
| driver | pxe_ipmitool |
| driver_info | {} |
| driver_internal_info | {} |
| extra | {} |
| inspection_finished_at | None |
| inspection_started_at | None |
| instance_info | {} |
| instance_uuid | None |
| last_error | None |
| maintenance | False |
| maintenance_reason | None |
| name | None |
| network_interface | |
| power_state | None |
| properties | {} |
| provision_state | available |
| provision_updated_at | None |
| raid_config | |
| reservation | None |
| resource_class | |
| target_power_state | None |
| target_provision_state | None |
| target_raid_config | |
| updated_at | None |
| uuid | 98a44c27-0cb5-43ea-b77f-624c75a7860d |
+------------------------+--------------------------------------+

# ironic chassis-list
+--------------------------------------+--------------------------------------------------+
| UUID | Description |
+--------------------------------------+--------------------------------------------------+
| a024b04a-37fe-446e-b79d-84ed9fa049d7 | Chassis with Node |
| b513aa04-cdcc-49bb-83d3-ac0890319f3f | Chassis without Node |
| d91c991f-9f46-4de8-9bed-47e5867925ae | Chassis without Node |
+--------------------------------------+--------------------------------------------------+

# ironic chassis-delete b513aa04-cdcc-49bb-83d3-ac0890319f3f a024b04a-37fe-446e-b79d-84ed9fa049d7 d91c991f-9f46-4de8-9bed-47e5867925ae
Deleted chassis b513aa04-cdcc-49bb-83d3-ac0890319f3f
Cannot complete the requested action because chassis a024b04a-37fe-446e-b79d-84ed9fa049d7 contains nodes. (HTTP 400)

Now here 3rd argumment should have deleted as it does not contain any node but it is not deleting it.