Jakub Klinkovský authored Sep 05, 2020 and Lukas Fleischer committed Feb 20, 2021

When the keyword parameter is empty, the AND clause has to be omitted,
otherwise we get an SQL syntax error:

... WHERE PackageBases.PackagerUID IS NOT NULL AND () ...

This got broken in commit 9e30013aa4fc6ce3a3c9f6f83a6fe789c1fc2456
Author: Kevin Morris <kevr.gtalk@gmail.com>
Date:   Sun Jul 5 18:19:06 2020 -0700

Support conjunctive keyword search in RPC interface
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>