[MERGE] remove has_key() usage

[Aaron Bentley]

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John Arbash Meinel wrote:
> 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.

I will +1 it and deal with whatever merge conflicts result.  But let's
not do a ton of these while nested-trees is outstanding.

Aaron
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