[sahara] relaunch job fail if job is created by saharaclient and no input args

[Ken Chen]

If we launch a job from a job_template without input args by saharaclient directly (not in Horizon), and then relaunch it on Horizon, you will get an error. This is because Horizon thinks job_configs always have elements 'args'. You can refer to horizon/openstack_dashboard/dashboards/project/data_processing/jobs/workflows/launch.py, line 190
job_args = json.dumps(job_configs['args'])

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/184033

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/184033
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=7fe5c80143aad1953d7de4df26b09dc4940f39af
Submitter: Jenkins
Branch: master

commit 7fe5c80143aad1953d7de4df26b09dc4940f39af
Author: Ken Chen <email address hidden>
Date: Mon May 18 19:58:27 2015 +0800

    Add a conditional judgement to avoid invalid dict index

    Before index the job_configs by key 'args', we add a judgement
    to see whether key 'args' exists.

    Closes-Bug: #1456171
    Change-Id: I42fa4bfe5d2b9a90833bae25bd9ac44c614fd9ce

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/kilo
Review: https://review.openstack.org/201074

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/201074
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=cfb16ecd5a16b214c9751d2e9a773dd9b0d8e69c
Submitter: Jenkins
Branch: stable/kilo

commit cfb16ecd5a16b214c9751d2e9a773dd9b0d8e69c
Author: Ken Chen <email address hidden>
Date: Mon May 18 19:58:27 2015 +0800

    Add a conditional judgement to avoid invalid dict index

    Before index the job_configs by key 'args', we add a judgement
    to see whether key 'args' exists.

    Closes-Bug: #1456171
    Change-Id: I42fa4bfe5d2b9a90833bae25bd9ac44c614fd9ce
    (cherry picked from commit 7fe5c80143aad1953d7de4df26b09dc4940f39af)