[data processing] Job details page links "None" for data sources

[Chad Roberts]

When you execute a job that does not require input/output data sources (such as a Spark job), the job details page attempts to link the data sources, which results in links that look like /project/data_processing/data_sources/None which will not work. Instead a skeleton data source details page comes up with an error message box.

If a data source is "None" for a job, we should not attempt to make it a link.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/175563

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/175563
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=1d9a488563f256c25218a666e8af5d43260a3d70
Submitter: Jenkins
Branch: master

commit 1d9a488563f256c25218a666e8af5d43260a3d70
Author: Chad Roberts <email address hidden>
Date: Mon Apr 20 16:18:36 2015 -0400

    Only show data sources if they are relevant for job

    We now only show the data sources (with links) on the
    job details page if data sources are actually used in the
    given job.

    Change-Id: I3eb309285261327350c971d2ac6d6637d831818c
    Closes-Bug: #1440813