[2.0] Fixed E_NOTICE being throwing when ->getSingleScalarResult() is called...

[2.0] Fixed E_NOTICE being throwing when ->getSingleScalarResult() is called and no result is found. Added coverage for this and also for multiple result (NonUniqueResultException).

lib/Doctrine/ORM/Internal/Hydration/SingleScalarHydrator.php

@@ -36,7 +36,11 @@ class SingleScalarHydrator extends AbstractHydrator
     {
         $cache = array();
         $result = $this->_stmt->fetchAll(\PDO::FETCH_ASSOC);
-        if (count($result) > 1 || count($result[key($result)]) > 1) {
+        $num = count($result);
+
+        if ($num == 0) {
+            throw new \Doctrine\ORM\NoResultException;
+        } else if ($num > 1 || count($result[key($result)]) > 1) {
             throw new \Doctrine\ORM\NonUniqueResultException;
         }
         $result = $this->_gatherScalarRowData($result[key($result)], $cache);

tests/Doctrine/Tests/ORM/Functional/QueryTest.php

@@ -227,6 +227,46 @@ class QueryTest extends \Doctrine\Tests\OrmFunctionalTestCase
              ->getSingleResult();
     }
 
+    /**
+     * @expectedException Doctrine\ORM\NoResultException
+     */
+    public function testGetSingleScalarResultThrowsExceptionOnNoResult()
+    {
+        $this->_em->createQuery("select a from Doctrine\Tests\Models\CMS\CmsArticle a")
+             ->getSingleScalarResult();
+    }
+
+    /**
+     * @expectedException Doctrine\ORM\NonUniqueResultException
+     */
+    public function testGetSingleScalarResultThrowsExceptionOnNonUniqueResult()
+    {
+        $user = new CmsUser;
+        $user->name = 'Guilherme';
+        $user->username = 'gblanco';
+        $user->status = 'developer';
+
+        $article1 = new CmsArticle;
+        $article1->topic = "Doctrine 2";
+        $article1->text = "This is an introduction to Doctrine 2.";
+        $user->addArticle($article1);
+
+        $article2 = new CmsArticle;
+        $article2->topic = "Symfony 2";
+        $article2->text = "This is an introduction to Symfony 2.";
+        $user->addArticle($article2);
+
+        $this->_em->persist($user);
+        $this->_em->persist($article1);
+        $this->_em->persist($article2);
+
+        $this->_em->flush();
+        $this->_em->clear();
+
+        $this->_em->createQuery("select a from Doctrine\Tests\Models\CMS\CmsArticle a")
+             ->getSingleScalarResult();
+    }
+
     public function testSupportsQueriesWithEntityNamespaces()
     {
         $this->_em->getConfiguration()->addEntityNamespace('CMS', 'Doctrine\Tests\Models\CMS');