fix for setup : can't open (null) for reading..

[Charles Wilson]

Robert Collins wrote:

> A new snapshot is available that address's this bug. Thanks to Fergus
> Bonham for some detailed test reports that really helped track this
> down. 
> Thanks to everyone who has persisted with setup while it had this bug...


No, thank *you* for being johnny-on-the-spot, rolling out bug fixes 
faster than most people can type. :-)

--Chuck