Avoid multiple tag creation

When a new tag is created but not yet persisted, it can be duplicated.
It could happen when multiple rules match the content and at least 2 of them should attach same new tag.

Fix #1528

src/Wallabag/CoreBundle/DataFixtures/ORM/LoadTaggingRuleData.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Wallabag\CoreBundle\DataFixtures\ORM;
+
+use Doctrine\Common\DataFixtures\AbstractFixture;
+use Doctrine\Common\DataFixtures\OrderedFixtureInterface;
+use Doctrine\Common\Persistence\ObjectManager;
+use Wallabag\CoreBundle\Entity\TaggingRule;
+
+class LoadTaggingRuleData extends AbstractFixture implements OrderedFixtureInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function load(ObjectManager $manager)
+    {
+        $tr1 = new TaggingRule();
+        $tr1->setRule('content matches "spurs"');
+        $tr1->setTags(array('sport'));
+        $tr1->setConfig($this->getReference('admin-config'));
+
+        $manager->persist($tr1);
+
+        $tr2 = new TaggingRule();
+        $tr2->setRule('content matches "basket"');
+        $tr2->setTags(array('sport'));
+        $tr2->setConfig($this->getReference('admin-config'));
+
+        $manager->persist($tr2);
+
+        $manager->flush();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getOrder()
+    {
+        return 40;
+    }
+}