[MERGE] remove has_key() usage

[Aaron Bentley]

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Martin Pool wrote:
> On 29 Aug 2006, Aaron Bentley <aaron.bentley at utoronto.ca> wrote:

>> I think my favorite is bool(file_id in self._byid)
> 
> Why?  For extra explicitness that it must be a bool, or do you really
> expect that 'in' might return something unsuitable?

Yes, for the extra explicitness.  Extra parens just don't telegraph it
to me.  But I can go with John's, if you prefer that.

Aaron
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