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Another fix from Chris: Guess's allow-blanks mode wasn't allowing
blanks...

[originally from svn r6118]

--- a/guess.c

+++ b/guess.c

@@ -768,7 +768,8 @@

 	for (i = 0; i < from->solution->npegs; i++) {

 	    int val = atoi(p);

-	    if (val <= 0 || val > from->params.ncolours) {

+	    int min_colour = from->params.allow_blank? 0 : 1;

+	    if (val < min_colour || val > from->params.ncolours) {

 		free_game(ret);

 		return NULL;

 	    }