Forbid moreblocks to register slopes!  - Avoid crash when trying to use commented function 'register_slope' in    stairsplus
Forbid moreblocks to register slopes!
 - Avoid crash when trying to use commented function 'register_slope' in
   stairsplus

crabman77/minetest-minetestforfun-server,sys4-fr/server-minetestforfun,Coethium/server-minetestforfun,paly2/minetest-minetestforfun-server,paly2/minetest-minetestforfun-server,Ombridride/minetest-minetestforfun-server,crabman77/minetest-minetestforfun-server,LeMagnesium/minetest-minetestforfun-server,Coethium/server-minetestforfun,Ombridride/minetest-minetestforfun-server,Coethium/server-minetestforfun,crabman77/minetest-minetestforfun-server,Gael-de-Sailly/minetest-minetestforfun-server,MinetestForFun/minetest-minetestforfun-server,sys4-fr/server-minetestforfun,Ombridride/minetest-minetestforfun-server,LeMagnesium/minetest-minetestforfun-server,MinetestForFun/server-minetestforfun,LeMagnesium/minetest-minetestforfun-server,MinetestForFun/server-minetestforfun,Gael-de-Sailly/minetest-minetestforfun-server,MinetestForFun/minetest-minetestforfun-server,MinetestForFun/minetest-minetestforfun-server,MinetestForFun/server-minetestforfun,sys4-fr/server-minetestforfun,Gael-de-Sailly/minetest-minetestforfun-server