Eye of ender does not store data in NBT

The bug

Throws eye of ender entities do not store their data in NBT. This causes them to fly to (0,0,0) after reloading them and always breaking (never dropping an item).

Affected data

• target position
• life time
• whether item should drop
• item (note that this is read from NBT)

How to reproduce

1. Create a world which has strongholds
2. Move close to (0,0)
3. Throw eye of enders
4. While they are still flying reopen the world
   They are now flying to (0,0,0) and never drop an item