[MERGE] remove has_key() usage

[John Arbash Meinel]

Robey Pointer wrote:
> 

...

> Okay, so pychecker can bite me. :)  I reverted all the '== None' stuff
> to 'is None' and pushed it to the same branch:
> 
>     http://www.lag.net/~robey/code/bzr.dev.no_has_key/
> 
> robey

So I reviewed the actual changes, and I'm +1 on the cleanup.

But I'll wait for another +1, because there is some discussion about how
it penalizes long lived branches.

John
=:->


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