Issue deleting external network from Horizon

[AJNOURI]

Had to delete the external network to configure a new one.
Removed all routers using it as gateway, all ipfloatnig ports and other ports conencted to private networks.

But couldn't delete it from the Horizon:

Even though I succeeded from CLI:

openstack network list

+--------------------------------------+------------------+--------------------------------------+
| ID | Name | Subnets |
+--------------------------------------+------------------+--------------------------------------+
| 267ed855-d615-4197-973d-ab843359889f | LAN1 | f2e19632-6b65-4cef-8ac8-e442bbf0cd62 |
| b1c927a8-83e8-441f-867f-b3b88aedc9f1 | external_network | c4dcccbc-e41c-43a7-9c6c-e97b645295b2 |
+--------------------------------------+------------------+--------------------------------------+

openstack network delete external_network

[root@devstack1 ~(keystone_admin)]#

openstack network list

+--------------------------------------+------+--------------------------------------+
| ID | Name | Subnets |
+--------------------------------------+------+--------------------------------------+
| 267ed855-d615-4197-973d-ab843359889f | LAN1 | f2e19632-6b65-4cef-8ac8-e442bbf0cd62 |
+--------------------------------------+------+--------------------------------------+

Could be related to #66