Join:with some of the children empty

Build 1323 on dzucconi/feat/components-5
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The baseline is shorter than the new snapshot (1178x383 to 1178x393).
Baseline History
Build 1323a252ca1
Current build. There are unaccepted changes, so build 1293 is still the baseline.
Build 1241e5a64b5
Accepted by Damon.
Build 450b70bff7
Auto-accepted
Build 4480129882
Accepted by Kieran.
Commenting is disabled because there's a newer build on this branch