To use the Oauth1 session, Is the logic correct?

[fmarcolino]

py-trello/trello/trelloclient.py

Line 41 in 8e5b696

if api_key or token:

py-trello/trello/trelloclient.py

Line 42 in 8e5b696

self.oauth = OAuth1(client_key=api_key, client_secret=api_secret,

py-trello/trello/trelloclient.py

Line 43 in 8e5b696

resource_owner_key=token, resource_owner_secret=token_secret)

py-trello/trello/trelloclient.py

Line 44 in 8e5b696

else:

py-trello/trello/trelloclient.py

Line 45 in 8e5b696

self.oauth = None

py-trello/trello/trelloclient.py

Line 46 in 8e5b696

Try use in the Python Shell the bellow command:

\>>> bool("string" or None)
True
... where "string" -> api_key and None -> token = None (for default).
So, for use the Oauth session, we need both the variables (api_key and token != None), or no?
If we use the logic operation OR, one variable different of None alread is valid (if api_key != None and token = None) -> True in this condition, which causes the execution of the first block wrongly.

Now, users can use only api_key and secret_key, which causes o `self.oauth = None'.
So, in my opinion, the operation logic should be AND.

I am using the logic operation AND, and the code is running perfectly well.

Good Night! Thanks for you approve my pull request!