R1:c310f08b7a5c

Work around workflow blocking error with duplicate "master" refs in "Land Revision"

Summary:
Ref T11823. See PHI68. T11823 has a full description of this issue and a plan to fix it, but the full plan is relatively complicated.

Until that can happen, provide a workaround for the biggest immediate issue, where multiple copies of a ref cursor can cause `executeOne()` to throw, since it expects a single result. In practice, these copies are always identical so we can just pick the first one.

This will get…