Merge branch 'master' into 'master'

Prevent the symptoms of Issue #33

See merge request VanessaE/pipeworks!31

autocrafter.lua

@@ -67,11 +67,8 @@ local function run_autocrafter(pos, elapsed)
 	local inventory = meta:get_inventory()
 	local craft = get_craft(pos, inventory)
 	local output_item = craft.output.item
-	-- NALC: existence de limitgroup ?
-	local limitcraft = minetest.get_item_group(output_item:get_name(), "limitcraft") or 0
 	-- only use crafts that have an actual result
-	-- NALC: ou si l'item n'est pas dans le group limitcraft
-	if output_item:is_empty() or limitcraft > 0 then
+	if output_item:is_empty() then
 		meta:set_string("infotext", S("unconfigured Autocrafter: unknown recipe"))
 		return false
 	end

luaentity.lua

@@ -340,6 +340,8 @@ local move_entities_globalstep_part2 = function(dtime)
 			entity._velocity = master_entity:get_velocity()
 			entity._acceleration = master_entity:get_acceleration()
 		else
+			entity._velocity = entity._velocity or vector.new(0,0,0)
+			entity._acceleration = entity._acceleration or vector.new(0,0,0)
 			entity._pos = vector.add(vector.add(
 				entity._pos,
 				vector.multiply(entity._velocity, dtime)),