[MERGE] make bzr script un-importable

[Aaron Bentley]

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Benjamin Peterson wrote:
> Hi Bazaar Developers,
> I was reading through Bazaar's source, and I noticed these lines in the
> main bzr script:
> if __name__ == "__main__":
>     # run bzr
> else:
>     pass    # should this give an error? - it can't be used as a lib
> This bundle makes importing the bzr script raise an ImportError.

bb:comment

Since the bzr script doesn't have a py extension, it's impossible to
import anyhow.

Aaron
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