fix: Fix reacting to subtype-only relations. #1079
Merged
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If we saw a hint like:
When we would reverse it, and try to go:
The
parent[children]
would blow up, b/c that o2m may not exist.This is very similar to conditionally walking through polys, so we reuse the same
parent@Subtype
to infra to stop the walking before trying to accessparent[children]
.