Safe Knot clear
this allow use the clear way in knotholder with safe removal inside, you remove once, if same knotholder entities remove again the knotholdder do noting and no crash. Backported in !5966 (closed)
this allow use the clear way in knotholder with safe removal inside, you remove once, if same knotholder entities remove again the knotholdder do noting and no crash. Backported in !5966 (closed)