Avoid a nil index crash

Kyle

2013-02-22 985401a23d1581e71f762bdaeadfc19734fdf148

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enable_item_drop=false
enable_item_pickup=true
enable_technic_inventory=true
enable_mining_drill=true
enable_mining_laser=true
enable_flashlight=true
enable_rubber_tree_generation=true
enable_marble_generation=true
enable_granite_generation=true
enable_obsidian_generation=true