[minor] Listen to error event on pool so we dont fail out unexpectedly anymore

lib/node-http-proxy.js

@@ -123,6 +123,12 @@ HttpProxy.prototype = {
     
     // Open new HTTP request to internal resource with will act as a reverse proxy pass
     var p = manager.getPool(port, server);
+    
+    p.on('error', function (err) {
+      // Remark: We should probably do something here
+      // but this is a hot-fix because I don't think 'pool' 
+      // should be emitting this event.
+    });
 
     p.request(req.method, req.url, req.headers, function (reverse_proxy) {
       // Create an error handler so we can use it temporarily