Fix T43694, by Krzysztof Re�?ko (chrisr), reviewed in D1177.
Added some guards to prevent clumping to non existing particles. Also, adjusted threaded child path evaluation, so each child is evaluated once - previously virtual parents were done twice.
Commit Details:
Full Hash: d4ac58d04989e8c2e1951a55519cfba53011d494 Parent Commit: 9fc1a29 Lines Changed: +31, -11