fix/webserver: recover gRPC handler panics and reject empty query nodes - #1140

fix/webserver: recover gRPC handler panics and reject empty query nodes#1140

keegancsmith merged 2 commits into

sourcegraph:mainsourcegraph/zoekt:mainfrom

vatsalpatel:fix/grpc-panic-recoveryvatsalpatel/zoekt:fix/grpc-panic-recoveryCopy head branch name to clipboard