fts: do not query the database if there is no clause to search

git-svn-id: https://svn.fournier38.fr/svn/ProgSVN/trunk@3473 bf3deb0d-5f1a-0410-827f-c0cc1f45334c

fts.php

@@ -76,6 +76,8 @@ class fts
   public function searchSQL ($query, $dblayeroo, $fields)
   {
     $regexes = $this->search ($query);
+    if (empty ($regexes["operator"]))
+      return array ();
     // Clone the object to not modify a previously defined query
     $dbl = clone $dblayeroo;
     $dbl->clearRequest ();