Fix syntax errors

Author: Loay Gewily

test/postgresql.test.js

@@ -90,11 +90,11 @@ describe('postgresql connector', function() {
       });
   });
 
-  it('should reserve property `count` after query execution', function(done) {
+  it('should preserve property `count` after query execution', function(done) {
     Post.create(
       {title: 'T10', content: 'C10'},
       function(err, p) {
-        should.not.exists(err);
+        if (err) return done(err);
         post = p;
         var query = "UPDATE PostWithBoolean SET title ='T20' WHERE id=" + post.id;
         db.connector.execute(query, function(err, results) {