Checking if a NBT exists?

[TLHPoE]

I'm adding integers into a NBTTagCompound. Currently trying to get the NBT at a different class, but that class fires before the NBT class. Is there anyway to check if the NBT exists?

[Mew]

if ( nbt != null ) {

// do the code

}

 

 

OR something like that...

[GotoLink]

If you have a specific nametag:

if(tag.hasKey("mynametag"))