Blender Git Loki

Object: improve on fix for Object.to_mesh() crash T86871

While fa7ddd0f43ea15dd19d81e7808de2bfe8cfc89ee fixed the reported issue,
the possibility of reusing runtime data during curve-to-mesh conversion
remained. Instead of treating the bounding-box as a special case,
clear all run-time data for temporary objects.

Ref D11026

Reviewed By: sergey