Java Edition 13w38b

13w38b is the sixth snapshot for 1.7.2, and 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 your hand, it looks invisible, like an actual air block.

Fixes
8 bugs fixed
 * – Hopper: java.lang.NullPointerException - Clicking in video settings screen.
 * – Main Menu does not display correctly.
 * – Block break animations no longer display.
 * – 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.