Changes

Summary

1. Add a few null world checks. TODO: INSERT EVERYWHERE \o/ Related to (commit: ef8d1fa) (details)

Commit ef8d1fa6eee55ff42467548de76c6a28ceb2dac5 by AlexIIL Add a few null world checks. TODO: INSERT EVERYWHERE \o/ Related to #3279 (commit: ef8d1fa)
	common/buildcraft/factory/TileTank.java (diff)
	common/buildcraft/factory/BlockTank.java (diff)
	common/buildcraft/core/lib/block/TileBuildCraft.java (diff)