Unhelpful/Erroneous error on bad node search

[ZachtimusPrime]

My Environment:

• Windows
• Python 3.6.2
• PyChef 0.3.0

Issue:
Erroneous "unauthorized" error message if the node hostname is in the wrong format.

Good Example (No erroneous space in front of hostname):

hostname = "hostname"

api = chef.ChefAPI.from_config_file("E:\\path\\to\\knife\\file")
node = chef.Node(hostname)

Good Result:
Comes back with node information if the node exists in Chef.

Bad Example (Erroneous space in front of hostname):

hostname = " hostname"

api = chef.ChefAPI.from_config_file("E:\\path\\to\\knife\\file")
node = chef.Node(hostname)

Bad Result:

Traceback (most recent call last):
  File "e:/chef/validate_host.py", line 33, in <module>
    node = chef.Node(hostname)
  File "C:\Program Files\Python36\lib\site-packages\chef\base.py", line 58, in __init__
    data = self.api[self.url]
  File "C:\Program Files\Python36\lib\site-packages\chef\api.py", line 221, in __getitem__
    return self.api_request('GET', path)
  File "C:\Program Files\Python36\lib\site-packages\chef\api.py", line 217, in api_request
    response = self.request(method, path, headers, data)
  File "C:\Program Files\Python36\lib\site-packages\chef\api.py", line 207, in request
    raise ChefServerError.from_error(response.reason, code=response.status_code)
chef.exceptions.ChefServerError: Unauthorized