'Something went wrong error' when non-admin user tries to delete metadata in Murano

[Anastasia Kuznetsova]

Steps to reproduce:
1. Log in Horizon
2. Create new project and non-admin user in it
3. Navigate to Murano > Manage > Images
4. Click on 'Delete Metadata' button for one of pre-installed images (for example TestVM) and confirm delition

Observed result:
Something went wrong!

An unexpected error has occurred. Try refreshing the page. If that doesn't help, contact your local administrator.

Expected result:
Error message that non-admin user doesn't have enough permissions to delete pre-installed metadata

[Dmitry Mescheryakov (dmitrymex)]

Just a minor validation error, hence lowering priority to low

[Ekaterina Chernova (efedorova)]

https://review.fuel-infra.org/#/c/3803/

[Anastasia Kuznetsova (akuznetsova)]

Verified in 6.1 on 310 ISO

{"build_id": "2015-04-13_22-54-31", "ostf_sha": "c2a76a60ec4ebbd78e508216c2e12787bf25e423", "build_number": "310", "release_versions": {"2014.2-6.1": {"VERSION": {"build_id": "2015-04-13_22-54-31", "ostf_sha": "c2a76a60ec4ebbd78e508216c2e12787bf25e423", "build_number": "310", "api": "1.0", "nailgun_sha": "d22c074dec091e5ddd8ea3003c37665058303cd5", "openstack_version": "2014.2-6.1", "production": "docker", "python-fuelclient_sha": "9208ff4a08dcb674ce2df132399a5aa3ddfac21c", "astute_sha": "d96a80b63198a578b2c159edbd76048819039eb0", "feature_groups": ["mirantis"], "release": "6.1", "fuelmain_sha": "335d3ed09ed79bd37e1f7a90442c4831c8845582", "fuellib_sha": "8b80657e9ceed8d59c2dff1c11e1481c7e69380e"}}}, "auth_required": true, "api": "1.0", "nailgun_sha": "d22c074dec091e5ddd8ea3003c37665058303cd5", "openstack_version": "2014.2-6.1", "production": "docker", "python-fuelclient_sha": "9208ff4a08dcb674ce2df132399a5aa3ddfac21c", "astute_sha": "d96a80b63198a578b2c159edbd76048819039eb0", "feature_groups": ["mirantis"], "release": "6.1", "fuelmain_sha": "335d3ed09ed79bd37e1f7a90442c4831c8845582", "fuellib_sha": "8b80657e9ceed8d59c2dff1c11e1481c7e69380e"}