[swcomp] Adjust requirements for compression ratio computation
[swcomp] Adjust requirements for compression ratio computation

The type of the input is no longer checked (since it is no longer need due to the addition of benchmarkInputSize); it is now correctly checked that the size of the output, not input, is non-zero.

tsolomko/SWCompression,tsolomko/SWCompression,tsolomko/SWCompression