fixes bug introduced in
https://github.com/increpare/PuzzleScript/commit/1231264d3fa655435ad601dc30fcd8f430043e9f
which is itself a manual copy of
https://github.com/rmmh/PuzzleScript/commit/73a4da81a98f8203700bad095e1780e79ab041e6
which is an otherwise-acceptable fix for
https://github.com/increpare/PuzzleScript/issues/109, with an
acknowledgement of @rmmh's comment
https://github.com/increpare/PuzzleScript/commit/1231264d3fa655435ad601dc30fcd8f430043e9f#commitcomment-6135565
point that my submission title was rather unhelpful and I would have
been better pulling the changelist properly (cf
https://www.kernel.org/pub/software/scm/git/docs/git-merge.html ).