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

[Aaron Bentley]

Karl Fogel wrote:
> 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?
> 
> From the bug's description:

I read the bug's description, both now and when it was originally filed.
 It didn't convince me or motivate me to address it.  I'm asking you,
because it did convince and motivate you.

Aaron