Proper error message should get displayed while trying to delete router interface

[Puneet Arora]

Steps:
1) Create network, subnet
2) Create router and attach subnet to router.
3) Attach router to external network as a gateway.
4) Create port and associate port to floatingip.
5) Goto Horizon and try to delete router-interface, it doesn't gives you proper error message.

Error message on Horizon:
Error: Unable to delete interface: (5148c328-d7df)

But same If I try to delete from cli, it throws proper error message:
$ neutron router-interface-delete 273b224e-033e-4fb4-89ca-6a7fcca595bd 4b00cb1e-75df-4555-88c3-66dfb826e295
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
Router interface for subnet 4b00cb1e-75df-4555-88c3-66dfb826e295 on router 273b224e-033e-4fb4-89ca-6a7fcca595bd cannot be deleted, as it is required by one or more floating IPs.

Can we make changes on horizon side also to provide proper error message just like cli throws message?

[Akihiro Motoki (amotoki)]

This is a horizon issue. Retarget it to horizon.