[BUG] wrong args for exception

[John Arbash Meinel]

Aaron Bentley wrote:
> Robert Widhopf-Fenk wrote:
>>> 'bzr commit -m "a"' on a tree without added files.
>>>
>>> bzr: ERROR: exceptions.TypeError: __init__() takes exactly 2 arguments (3 given)
> 
> This was already reported earlier this week by John Meinel.  See "[bug]
> bzr commit with nothing changed fails with the wrong exception"
> 
> John, your patch was empty in that message.  Are you ever going to post
> your patch?
> 
> Aaron

I didn't realize there was no patch.
Attached is a fix + a test case that I wrote last week.

John
=:->
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