fix(server): don't emit error in connect if closing/closed

Author: mbroadst

lib/core/sdam/server.js

@@ -166,6 +166,7 @@ class Server extends EventEmitter {
     relayEvents(this.s.pool, this, ['commandStarted', 'commandSucceeded', 'commandFailed']);
 
     stateTransition(this, STATE_CONNECTING);
+
     this.s.pool.connect(connectEventHandler(this));
   }
 
@@ -465,10 +466,14 @@ function executeWriteOperation(args, options, callback) {
 
 function connectEventHandler(server) {
   return function(err, conn) {
+    if (server.s.state === STATE_CLOSING || server.s.state === STATE_CLOSED) {
+      return;
+    }
+
     if (err) {
       server.emit('error', new MongoNetworkError(err));
 
-      stateTransition(this, STATE_CLOSED);
+      stateTransition(server, STATE_CLOSED);
       server.emit('close');
       return;
     }