[MERGE] Trivial fix to automatic plugin suggestion core code

[Aaron Bentley]

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Martin Albisetti wrote:
> I've started to work on the plugin infrastructure again, and I'm
> aiming at having it work as a plugin as soon as possible.
> 
> While I was working, I realized I missed something in my previous
> merge, which was for bzr not to output the plugin suggestion with "bzr
> ERROR:".

bb:comment

I think that it is an error if you specify a command that isn't
supported, whether or not plugin provides that command.  Why shouldn't
we emit "bzr ERROR"?

Aaron
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