10.0.swarm.failures_report fails with JSON decode error

[Dennis Dmitriev]

Script 'generate_failure_group_statistics.py' is failed with the following error while getting builds data from Jenkins:

2016-07-13 15:00:08,171 - INFO - Latest build number is 172. Job is 9.0.swarm.runner
2016-07-13 15:00:08,171 - INFO generate_failure_group_statistics.py:784 -- Latest build number is 172. Job is 9.0.swarm.runner
2016-07-13 15:00:08,171 - INFO - Getting subbuilds for 9.0.swarm.runner 172
2016-07-13 15:00:08,171 - INFO generate_failure_group_statistics.py:788 -- Getting subbuilds for 9.0.swarm.runner 172
Traceback (most recent call last):
  File "fuelweb_test/testrail/generate_failure_group_statistics.py", line 844, in <module>
    sys.exit(main())
  File "fuelweb_test/testrail/generate_failure_group_statistics.py", line 789, in main
    subbuilds, swarm_jenkins_info = get_sub_builds(args.build_number)
  File "fuelweb_test/testrail/generate_failure_group_statistics.py", line 394, in get_sub_builds
    runner_build = Build(job_name, build_number)
  File "/home/jenkins/workspace/10.0.swarm.failures_report/fuelweb_test/testrail/builds.py", line 90, in __init__
    self.build_data = self.get_build_data(depth=0)
  File "/home/jenkins/workspace/10.0.swarm.failures_report/fuelweb_test/testrail/builds.py", line 111, in get_build_data
    return requests.get(build_url).json()
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/requests/models.py", line 812, in json
    return complexjson.loads(self.text, **kwargs)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/simplejson/__init__.py", line 516, in loads
    return _default_decoder.decode(s)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/simplejson/decoder.py", line 370, in decode
    obj, end = self.raw_decode(s)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/simplejson/decoder.py", line 400, in raw_decode
    return self.scan_once(s, idx=_w(s, idx).end())
simplejson.scanner.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

[Stanislaw Bogatkin (sbogatkin)]

Move to incomplete. Provide proper fuel version, diagnostic snapshot and a way to reproduce this bug, please.