Don't throw if tables to clear don't exist
Don't throw if tables to clear don't exist

The tables won't exist in a fresh postgres.

clojars/clojars-web,tobias/clojars-web,tobias/clojars-web,clojars/clojars-web,ato/clojars-web,tobias/clojars-web,clojars/clojars-web,ato/clojars-web