Fix issues with null or empty indexes in conditional index code#19386

Draft

richardkchapman wants to merge 3 commits intohpcc-systems:candidate-9.6.xfrom richardkchapman:issue33054

+196-11

Commits on Jan 7, 2025

HPCC-33054 Codegen support KEYED JOIN where rhs may evaluate to a null dataset
ghalliday
committed

Commits on Jan 8, 2025