fixed client passing for native pg implementation

lib/dialects/postgres/connector-manager.js

+
 var Query   = require("./query")
   , Utils   = require("../../utils")
 
@@ -110,6 +111,8 @@ module.exports = (function() {
             emitter.emit('error', err)
             break
           }
+        } else {
+          emitter.emit('error', new Error(err.message))
         }
       } else if (client) {
         var timezoneCallback = function() {
@@ -139,7 +142,9 @@ module.exports = (function() {
       } else {
         //create one-off client
         this.client = new this.pg.Client(uri)
-        this.client.connect(connectCallback)
+        this.client.connect(function(err, client, done) {
+          connectCallback(err, client || self.client, done)
+        })
       }
     }