Added fix so that if sc-client is run without any arguments it prints a warning and the short usage.
Added fix so that if sc-client is run without any arguments it prints a warning and the short usage.

pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus