actually fixed it this time

rhythmblock.lua

@@ -31,6 +31,9 @@ if arg[1] == nil then
 		if driveCount > 1 then
 			print("Too many disk drives. Specify where the desired disk drive is by running 'rhythmbox [drive position]'") -- For safety reasons
 			return false	
+		elseif driveCount == 0 then
+			print "No drive"
+                	return false -- Exits if there's no disk drive
 		end
 	end
 else