ref: b0614e6da8f8a709e8fad797d7bb6ba05491ac79
parent: cd76bfb25f68bb320587bf85a059ee83c3d05239
author: Simon Tatham <anakin@pobox.com>
date: Mon Aug 22 05:27:52 EDT 2005
`Solve' operation on an already solved map without an aux_info was returning NULL due to no moves being required, leading to a strange error message. Trivial fix. [originally from svn r6198]