SPIGOT-4882: EntityExplodeEvent appears to fire every tick because of enderdragon

nms-patches/EntityEnderDragon.patch

@@ -70,11 +70,16 @@
                          } else {
                              flag = true;
                          }
-@@ -407,6 +428,43 @@
+@@ -407,6 +428,48 @@
              }
          }
  
 +        // CraftBukkit start - Set off an EntityExplodeEvent for the dragon exploding all these blocks
++        // SPIGOT-4882: don't fire event if nothing hit
++        if (!flag1) {
++            return flag;
++        }
++
 +        org.bukkit.entity.Entity bukkitEntity = this.getBukkitEntity();
 +        EntityExplodeEvent event = new EntityExplodeEvent(bukkitEntity, bukkitEntity.getLocation(), destroyedBlocks, 0F);
 +        bukkitEntity.getServer().getPluginManager().callEvent(event);