psql: Improve expanded print output in tuples-only mode

When there are zero result rows, in expanded mode, "(No rows)" is
printed.  So far, there was no way to turn this off.  Now, when
tuples-only mode is turned on, nothing is printed in this case.
psql: Improve unaligned expanded output for zero rows

This used to erroneously print an empty line.  Now it prints nothing.