Changed the way that the cat.on_spawn picks a texture from the list.

mods/ENTITIES/mobs_mc/ocelot.lua

@@ -162,7 +162,8 @@ cat.on_spawn  = function(self)
 		self._texture = {"mobs_mc_cat_black.png"}
 	end
 	if not self._texture then
-		self._texture = cat.textures[math.random(#cat.textures)]
+		local max_tex = table.maxn (cat.textures)
+		self._texture = cat.textures[pr.next(1,max_tex)] -- pick a random texture.
 	end
 	self.object:set_properties({textures = {self._texture}})
 end