12a20b78d3d9b0f3d5ef9cc6a81ae2619c82db88

This reduces stress on the task scheduler and avoids some unwanted overhead caused by all the threading business in the cases when there's only one children node. We try to immediately switch to it's evaluation now, keeping active thread up and running. This bumps FPS from 58 to 64 on the blenrig test file from jpbouza.
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