langchain

11505f95 - Improve handling of empty queries for timescale vector (#12393)

Improve handling of empty queries for timescale vector (#12393) **Description:** Improve handling of empty queries in timescale-vector. For timescale-vector it is more efficient to get a None embedding when the embedding has no semantic meaning. It allows timescale-vector to perform more optimizations. Thus, when the query is empty, use a None embedding. Also pass down constructor arguments to the timescale vector client. --------- Co-authored-by: Bagatur <baskaryan@gmail.com>