virt-who fails with a traceback

Issue

*virt-who fails with the following traceback:

2018-07-09 16:35:54,052 [virtwho.destination_6111436756220480661 ERROR] MainProc
ess(11923):Thread-61 @virt.py:run:388 - Thread 'destination_6111436756220480661'
 fails with exception:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/virtwho/virt/virt.py", line 379, in run
    self._run()
  File "/usr/lib/python2.7/site-packages/virtwho/virt/virt.py", line 335, in _run
    self._send_data(data_to_send)
  File "/usr/lib/python2.7/site-packages/virtwho/virt/virt.py", line 665, in _send_data
    self.dest.check_report_state(batch_host_guest_report)
  File "/usr/lib/python2.7/site-packages/virtwho/manager/subscriptionmanager/subscriptionmanager.py", line 353, in check_report_state
    for fail in result_data.get('failedUpdate', []):
AttributeError: 'unicode' object has no attribute 'get'