[MERGE] Fix for 306394: warning, not error, on non-existent file.

[Karl Fogel]

Aaron Bentley <aaron at aaronbentley.com> writes:
> Karl Fogel wrote:
>> Attached is a fix for https://bugs.edge.launchpad.net/bzr/+bug/306394:
>
> Why is it bad to error on a non-existent file?  What are the use cases?