Fix: bFinalize TypeError on Blender 5.2 (bbone scale cleanup)
bFinalize clears the bbone driver-source properties by assigning scalar 0, relying on a ValueError fallback for the vector bbone_scalein/out. Blender 5.2 raises TypeError for a scalar assigned to a vector RNA property, so finalize dies after the rig is fully built. Widen the except; ValueError still covers older versions.