Comment 7 for bug 1619586

Reviewed: https://review.openstack.org/375268
Committed: https://git.openstack.org/cgit/openstack/python-fuelclient/commit/?id=5c1d3a4ba3af3d78f2e7bfdd804da3dec108e755
Submitter: Jenkins
Branch: stable/mitaka

commit 5c1d3a4ba3af3d78f2e7bfdd804da3dec108e755
Author: tivaliy <email address hidden>
Date: Sun Sep 4 07:30:50 2016 +0300

    Add files verification for 'fuel2 graph upload' command

    Now Nailgun reports about successful upload of deployment graph
    from directory that can even not contain any 'tasks.yaml' files.
    This patch fixes:
      * check if at least one 'tasks.yaml' file exists in specified
        directory path
      * check if at least one 'tasks.yaml' file in specified
        directory path is not empty

    Change-Id: I5de2474b8fbb46780450ee3873af6189a6cf17cc
    Closes-Bug: 1619586
    (cherry picked from commit 9dfb28e33cfc1e40c5bd00feae0e78888f2957b9)