fix: JS null pointer error on Doctum.cleanSearchQuery

Author: williamdes

src/Resources/themes/default/doctum.js.twig

@@ -282,10 +282,13 @@ var Doctum = {
     /**
      * Clean the search query
      *
-     * @param string query
+     * @param string|null query
      * @return string
      */
     cleanSearchQuery: function (query) {
+        if (typeof query !== 'string') {
+            return '';
+        }
         // replace any chars that could lead to injecting code in our regex
         // remove start or end spaces
         // replace backslashes by an escaped version, use case in search: \myRootFunction