Avoid division by zero when calculating inertias for bodies with colliders without areas.
Avoid division by zero when calculating inertias for bodies with colliders without areas.

(cherry picked from commit e347baddf3f08f3892cfcc97bd03b242dd5d1053)

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot