possible hud.open bug fix

src/frontend/hud.cpp

@@ -538,6 +538,7 @@ void Hud::closeInventory() {
     exchangeSlotInv = nullptr;
     inventoryOpen = false;
     inventoryView = nullptr;
+    secondInvView = nullptr;
     secondUI = nullptr;
 
     for (auto& element : elements) {

src/logic/scripting/lua/libs/libhud.cpp

@@ -46,7 +46,7 @@ static int l_open(lua::State* L) {
     }
     return lua::pushinteger(L, hud->openInventory(
         layout,
-        level->inventories->get(invid),
+        lua::isnoneornil(L, 3) ? nullptr : level->inventories->get(invid),
         playerInventory
     )->getId());
 }