The test currently expects all reader slots to be populated. This means the cards may plugged into a random order, but there may not be any empty slots in the system at all. This requirement is easy to meet when each card has its own single-slot USB PCSC-reader, but as soon as multislot readers are used there may be some empty slots. Related: OS#6532 Change-Id: I7ba1d1350b6998d65e90408184accdb212556a7c