shithub: puzzles

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Require a grid description for hats grid

Without this, you can cause a null-pointer dereference by passing Loopy
a game description with no grid description, like "10x10t16:".

--- a/grid.c

+++ b/grid.c

@@ -3496,6 +3496,9 @@

     struct HatPatchParams hp;

     const char *error = NULL;

+    if (!desc)

+        return "Missing grid description string.";

+

     error = grid_desc_to_hat_params(desc, &hp);

     if (!error)

         error = hat_tiling_params_invalid(&hp);