Fix bug in ChBeamSectionRayleighAdvancedGeneric constructor (use of uninitialized variable)
Fix bug in ChBeamSectionRayleighAdvancedGeneric constructor (use of uninitialized variable)

rserban/chrono,rserban/chrono,dariomangoni/chrono,projectchrono/chrono,rserban/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,Milad-Rakhsha/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,dariomangoni/chrono,dariomangoni/chrono,rserban/chrono,rserban/chrono,Milad-Rakhsha/chrono,rserban/chrono,projectchrono/chrono,dariomangoni/chrono,dariomangoni/chrono,rserban/chrono