Don't RETURN for 0 voxels

The game assumes that if there is no return value, it should default to 0.

Where possible, avoid the need for checking for or returning 0

The following has a size of 11 and a speed of 4.

if x==y then
	return 1
else
	return 0
end

Whereas the following is size of 8 and speed of 3.143:

if x==y then
	return 1
end
-- Note that this otherwise will assume a default return of 0