virt-who not working with RHEV 4 giving error of "Virt backend 'rhvm' fails with exception: KeyError: 'major'"

Issue

• Following steps as given in guide CONFIGURING VIRT-WHO TO CONNECT TO RED HAT ENTERPRISE VIRTUALIZATION HYPERVISOR gives below error when run

# virt-who --one-shot

2017-05-25 09:41:13,340 [virtwho.rhev-m lab ERROR] RhevM-1(1525):MainThread @virt.py:run:394 - Virt backend 'rhev-m lab' fails with exception:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/virtwho/virt/virt.py", line 387, in run
    self._run()
  File "/usr/lib/python2.7/site-packages/virtwho/virt/virt.py", line 421, in _run
    self.prepare()
  File "/usr/lib/python2.7/site-packages/virtwho/virt/rhevm/rhevm.py", line 80, in prepare
    self.get_version()
  File "/usr/lib/python2.7/site-packages/virtwho/virt/rhevm/rhevm.py", line 124, in get_version
    major = version.attrib['major']
KeyError: 'major'