Deploy button is blocked in UI if scaling was failed

[Bogdan Dobrelya]

Then deployment was failed on adding new compute nodes, the deploy button stays blocked.
This could be work arounded by fuel cli, so the bug is minor.

{"build_id": "2015-03-01_22-54-44", "ostf_sha": "5cc59010fd4db71dc45e87b31ff24325d9a7f28f", "build_number": "153", "release_versions": {"2014.2-6.1": {"VERSION": {"build_id": "2015-03-01_22-54-44", "ostf_sha": "5cc59010fd4db71dc45e87b31ff24325d9a7f28f", "build_number": "153", "api": "1.0", "nailgun_sha": "c2b857b040a2e2121727aa874d0dff1374d6e5ce", "production": "docker", "python-fuelclient_sha": "3ebfa9c14a192d0298ff787526bf990055a23694", "astute_sha": "3a39ae300b8b3b02afbee03ea5116cd5357f8fc5", "feature_groups": ["mirantis"], "release": "6.1", "fuelmain_sha": "baf24424a4e056c6753913de5f8c94851903f718", "fuellib_sha": "510e82f3fd21e45fe757058bf5e658669765f02e"}}}, "auth_required": true, "api": "1.0", "nailgun_sha": "c2b857b040a2e2121727aa874d0dff1374d6e5ce", "production": "docker", "python-fuelclient_sha": "3ebfa9c14a192d0298ff787526bf990055a23694", "astute_sha": "3a39ae300b8b3b02afbee03ea5116cd5357f8fc5", "feature_groups": ["mirantis"], "release": "6.1", "fuelmain_sha": "baf24424a4e056c6753913de5f8c94851903f718", "fuellib_sha": "510e82f3fd21e45fe757058bf5e658669765f02e"}