Join:with some of the children empty

Build 1596 on dzucconi/fix/WP-60--join
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Baseline History
Build 1596666fc33
Current build. There are unaccepted changes, so build 1324 is still the baseline.
Build 1293fa1b869
Accepted by Damon.
Build 1241e5a64b5
Accepted by Damon.
Build 450b70bff7
Auto-accepted
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