[#175994414] Bug fix: Values for newly created case treated as zero in computation of LSRL
[#175994414] Bug fix: Values for newly created case treated as zero in computation of LSRL

- A new case can get added to data config's _casesCache without screening for proper values. Catch that during computation.

concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap