Empty tag search will look for not tagged links

Fixes #784

From now, searching for tags with an empty value will return only not tagged links,
with the search bar showing `x results [not tagged]`.

Note that using the api, the searchtags request parameter must be set to `false` to get the same result.

  - [ ] Update API doc

1 files changed, 4 insertions, 0 deletions

diff --git a/application/Utils.php b/application/Utils.php
index 5c077450..87e5cc8f 100644
--- a/application/Utils.php
+++ b/application/Utils.php
@@ -91,6 +91,10 @@ function endsWith($haystack, $needle, $case = true)
  */
 function escape($input)
 {
+    if (is_bool($input)) {
+        return $input;
+    }
+
     if (is_array($input)) {
         $out = array();
         foreach($input as $key => $value) {