"Ensemble Classification Data" should produce the result file name from the input file names, if possible, if "Output file" parameter is empty

There is a parameter "Output file" in "Ensemble Classification Data" workflow element. If it is empty, the element writes the result to the file with name "ensemble.csv".
In some cases (e.g. in case of "Parallel classification..." workflow samples) it is possible to recognize the reads file name, classification was produced from. In these cases the result file name should be produces from the reads file name.