pool settings are not transported down to replica connections

lib/dialects/mysql/connector-manager.js

@@ -289,7 +289,7 @@ module.exports = (function() {
     connection.query("SET time_zone = '+0:00'");
     // client.setMaxListeners(self.maxConcurrentQueries)
     this.isConnecting = false
-    if (config.pool.handleDisconnects) {
+    if ((config.pool != null && config.pool.handleDisconnects) {
       handleDisconnect(this.pool, connection)
     }
     done(null, connection)