UnboundLocalError: local variable 'result' referenced before assignment

[Vasily Gorin]

CI: https://product-ci.infra.mirantis.net/view/8.0_swarm/job/8.0.system_test.ubuntu.thread_1/10/console

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ERROR: Test current installation has correctly setup cobbler
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Traceback (most recent call last):
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/case.py", line 296, in testng_method_mistake_capture_func
    compatability.capture_type_error(s_func)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/compatability/exceptions_2_6.py", line 27, in capture_type_error
    func()
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/case.py", line 350, in func
    func(test_case.state.get_state())
  File "/home/jenkins/workspace/8.0.system_test.ubuntu.thread_1/fuelweb_test/helpers/decorators.py", line 80, in wrapper
    result = func(*args, **kwargs)
  File "/home/jenkins/workspace/8.0.system_test.ubuntu.thread_1/fuelweb_test/tests/test_admin_node.py", line 62, in test_cobbler_alive
    config = self.env.get_fuel_settings()
  File "/home/jenkins/workspace/8.0.system_test.ubuntu.thread_1/fuelweb_test/models/environment.py", line 509, in get_fuel_settings
    if result['exit_code'] == 0:
UnboundLocalError: local variable 'result' referenced before assignment