Revert "Sanity check if the point set is empty"

This reverts commit a3efa8e3659363e47b8241a76f39039d119d6c2c.
README file updated
Merge branch 'trac-3581-last-point-of-point-set-stays-visible-2' into niftk
Merge branch 'niftk' into midas

Conflicts:
	README