Fixed the bag "leaking" items

Closes #373

src/main/java/de/ellpeck/actuallyadditions/mod/items/ItemBag.java

@@ -126,9 +126,15 @@ public class ItemBag extends ItemBase{
                     }
                 }
             }
+
+            if(!StackUtil.isValid(stack)){
+                item.setDead();
+            }
+            else{
                 item.setEntityItemStack(stack);
             }
         }
+    }
 
     @Override
     public EnumActionResult onItemUse(ItemStack stack, EntityPlayer playerIn, World worldIn, BlockPos pos, EnumHand hand, EnumFacing facing, float hitX, float hitY, float hitZ){