Misleading message on project create

[Dimitri Mazmanov]

<<Just trying to improve user experience.>>

Use case:

Admin creates a new project/tenant with the same name as one of the existing projects.
An error message pops up saying: "Error: Unable to create project 'test'." It's not clear why the operation failed.
It would be much better to show something like "Error: Unable to create project
'test': a project with this name already exists. Please choose a different name.".

Ideally this should also be checked before submitting the project create form.

[Rob Cresswell (robcresswell-deactivatedaccount)]

This is really covered by the blanket poor handling of errors within Horizon

[Dimitri Mazmanov (sorantis)]

I could help with this. Got fixes ready to commit.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/175096

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/175096
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=894e4d38246f3c7630db7898f1a8fd36aba31199
Submitter: Jenkins
Branch: master

commit 894e4d38246f3c7630db7898f1a8fd36aba31199
Author: Dimitri Mazmanov <email address hidden>
Date: Sat Apr 18 02:59:05 2015 +0200

    Fix error message on project create

    Added a concrete project name validation error in case
    a project with such name already exists.

    Change-Id: I089970cfa5d512469c3f73987e21d4c7cbadc04c
    Closes-Bug: #1445055