Java Edition 13w38b

13w38b was released to fix some of the bugs and crashes in the 13w38a snapshot.

Additions

 * Added bumpy shader

Changes

 * Redefined the concept of Air
 * Is now an actual block instead of the absence of a block (null)
 * It can be kept in the inventory.
 * It looks like a magenta and black checker pattern (the missing texture) in the inventory,when dropped, and when put into an item frame, but when held in the hand, it looks invisible.

Fixes
9 bugs fixed
 * – Hopper: java.lang.NullPointerException - Clicking in video settings screen.
 * – Main Menu does not display correctly.
 * – Block break animations no longer display.
 * – Player showing up multiple times on adjacent maps.
 * – Player icons on maps in item frames.
 * – Map disappearing when leaving world.
 * – Scoreboard does not display sidebar anymore.
 * – Chatbar background doesn't show when typing.
 * – Placed tripwire string does not show its texture.