Fixed a crash when holding the key to display block info, but no block is un the mouse cursor.
Fixed a crash when holding the key to display block info, but no block is un the mouse cursor.

Khroki/MCEdit-Unified,gpmidi/MCEdit-Unified,fhfuih/MCEdit-Unified,skinny121/MCEdit-TallWorlds,skinny121/MCEdit-TallWorlds,Khroki/MCEdit-Unified,fhfuih/MCEdit-Unified,gpmidi/MCEdit-Unified,fhfuih/MCEdit-Unified,skinny121/MCEdit-TallWorlds,Khroki/MCEdit-Unified,gpmidi/MCEdit-Unified