This came to my attention via the email from github.
The problem was reported as being after toolchange on sim/vismach/VMC_index
But, it is super-easy to reproduce, just open sim/remap/rack
toolchange, the error:
"Near line 0 of {path} exception during generator call:
TypeError:'NoneType' object
Peter, I like your idea of calculating a velocity if none is provided. I'll
take a look at the PID component.
Andy / Chris, from your feedback, it sounds like cases like Jon's are rare,
but we shouldn't break them. Peter's approach gives a safe if suboptimal
fallback. If the future manual explains
