[sqlite] FTS5 External Content Table - REPLACE - SQL logic error or missing database

[chromedou...@yahoo.com]

This is on v3.9.1. I'm not sure exactly when it stopped working. I was using 
the external content functionality with triggers to keep the virtual table 
updated as part of a larger program, but found that the referenced example from 
the docs exhibits the same issue. INSERT's work fine, but REPLACE gives this 
error now.