SPIGOT-5965: BlockRedstoneEvent.setNewCurrent(0) crashes server

nms-patches/BlockRedstoneWire.patch

@@ -9,7 +9,7 @@
  public class BlockRedstoneWire extends Block {
  
      public static final BlockStateEnum<BlockPropertyRedstoneSide> NORTH = BlockProperties.X;
-@@ -213,7 +215,14 @@
+@@ -213,7 +215,16 @@
      private void a(World world, BlockPosition blockposition, IBlockData iblockdata) {
          int i = this.a(world, blockposition);
  
@@ -21,6 +21,8 @@
 +            world.getServer().getPluginManager().callEvent(event);
 +
 +            i = event.getNewCurrent();
++        }
++        if (oldPower != i) {
 +            // CraftBukkit end
              if (world.getType(blockposition) == iblockdata) {
                  world.setTypeAndData(blockposition, (IBlockData) iblockdata.set(BlockRedstoneWire.POWER, i), 2);