fix to return false for non-hull argument
fix to return false for non-hull argument

pietro909/PhysicsJS,mcanthony/PhysicsJS,griever989/PhysicsJS,pietro909/PhysicsJS,VANITAX/PhysicsJS,131/PhysicsJS,Nayar/PhysicsJS,rohit765/PhysicsJS,jpellerin/PhysicsJS,rohit765/PhysicsJS,eric-seekas/PhysicsJS,wellcaffeinated/PhysicsJS,griever989/PhysicsJS,Luwdo/PhysicsJS,Nayar/PhysicsJS,haithemaraissia/PhysicsJS,jpellerin/PhysicsJS,haithemaraissia/PhysicsJS,Luwdo/PhysicsJS,wellcaffeinated/PhysicsJS,eric-seekas/PhysicsJS,Rawneed/PhysicsJS,VANITAX/PhysicsJS,aldeed/PhysicsJS,mcanthony/PhysicsJS,Rawneed/PhysicsJS,aldeed/PhysicsJS