[MERGE] remove has_key() usage

[Aaron Bentley]

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John Arbash Meinel wrote:
> I think for a return value, I prefer:
> 
> return (file_id in self._byid)
> 
> Because I think it makes it a little bit clearer that you aren't
> returning the file_id.

I think my favorite is bool(file_id in self._byid)

Aaron
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