Remove safeguard against zero mass bodies, for various reasons: - no warnings are thrown, so the user might be confused in case he thinks he's simulating a zero mass body and instead it still works with the original mass. - one might want to use the new ChLoadBodyInertia to completely replace the original body mass - there was no warning/safeguard for SetInertiaXX and XY with zero values, so it was not protecting the user from doing this type of mistakes anyway.
Remove safeguard against zero mass bodies, for various reasons:
- no warnings are thrown, so the user might be confused in case he thinks he's simulating a zero mass body and instead it still works with the original mass.
- one might want to use the new ChLoadBodyInertia to completely replace the original body mass
- there was no warning/safeguard for SetInertiaXX and XY with zero values, so it was not protecting the user from doing this type of mistakes anyway.

rserban/chrono,projectchrono/chrono,projectchrono/chrono,projectchrono/chrono,dariomangoni/chrono,rserban/chrono,dariomangoni/chrono,dariomangoni/chrono,projectchrono/chrono,rserban/chrono,projectchrono/chrono,dariomangoni/chrono,dariomangoni/chrono,rserban/chrono,rserban/chrono,projectchrono/chrono,rserban/chrono,dariomangoni/chrono,rserban/chrono