Check if client exists before referencing client_id

[singingwolfboy]

I'm trying to instantiate an OAuth2Session object, and populate information (like client_id) after the initialization code has already run. This change is necessary for that -- otherwise, I get AttributeError: 'NoneType' object has no attribute 'client_id'

[coveralls]

Coverage increased (+0.08%) to 85.87% when pulling 1859bad on singingwolfboy:allow-setting-values-after-initialization into 50e8529 on requests:master.

[coveralls]

Coverage increased (+0.08%) to 85.87% when pulling 1859bad on singingwolfboy:allow-setting-values-after-initialization into 50e8529 on requests:master.

[singingwolfboy]

ping

[coveralls]

Coverage increased (+0.08%) to 85.91% when pulling c39f2f0 on singingwolfboy:allow-setting-values-after-initialization into 5e6a88e on requests:master.

[coveralls]

Coverage increased (+0.08%) to 85.91% when pulling c39f2f0 on singingwolfboy:allow-setting-values-after-initialization into 5e6a88e on requests:master.

[Lukasa]

Can this be an explicit None check? if client is not None

[singingwolfboy]

Fixed.

[coveralls]

Coverage decreased (-1.03%) to 84.81% when pulling f3523b9 on singingwolfboy:allow-setting-values-after-initialization into 5e6a88e on requests:master.

[singingwolfboy]

ping

[singingwolfboy]

@Lukasa Thanks! Any chance you can make another release on PyPI to bring this fix out to the world? (You might want to address #165 while you're at it.)

[Lukasa]

I've just pushed 0.5.0. =)