SPIGOT-2387: Magma does not provide a block for EntityDamageEvent.

By: md_5 <git@md-5.net>

paper-server/nms-patches/BlockCactus.patch

@@ -21,13 +21,11 @@
                      world.setTypeAndData(blockposition, iblockdata1, 4);
                      iblockdata1.doPhysics(world, blockposition1, this);
                  } else {
-@@ -87,7 +90,9 @@
+@@ -87,6 +90,7 @@
      }
  
      public void a(World world, BlockPosition blockposition, IBlockData iblockdata, Entity entity) {
 +        CraftEventFactory.blockDamage = world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ()); // CraftBukkit
          entity.damageEntity(DamageSource.CACTUS, 1.0F);
-+        CraftEventFactory.blockDamage = null; // CraftBukkit
      }
  
-     public IBlockData fromLegacyData(int i) {