no default value for errorlog

psiturk/default_configs/local_config_defaults.txt

@@ -164,7 +164,7 @@ port = 22362
 # If ON_CLOUD env var is set, then these both default to stdout (-)
 #
 accesslog = /dev/null
-errorlog = server.log
+errorlog =
 # For backwards compatibility, `logfile` is synonymous with `errorlog`. If
 # both are set, `errorlog` will be preferred over `logfile`.
 logfile = server.log