Merge pull request #3362 from sviande/fix_3361_api_warning

Fix #3361 check type for tags in entry repository

src/Wallabag/CoreBundle/Repository/EntryRepository.php

@@ -151,7 +151,7 @@ class EntryRepository extends EntityRepository
             $qb->andWhere('e.updatedAt > :since')->setParameter('since', new \DateTime(date('Y-m-d H:i:s', $since)));
         }
 
-        if ('' !== $tags) {
+        if (is_string($tags) && '' !== $tags) {
             foreach (explode(',', $tags) as $i => $tag) {
                 $entryAlias = 'e' . $i;
                 $tagAlias = 't' . $i;