bug 2228 fixed: there should be no blank space in the URL to avoid infinite

loop redirection (this happens with chinese only characters + blank space in
the category name).

Note: this problem does not concern tag names because there is no redirection
when the tag name does not match tags.url_name


git-svn-id: http://piwigo.org/svn/branches/2.1@9819 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions.inc.php

@@ -382,7 +382,7 @@ function str2url($str)
 
   if (empty($res))
   {
-    $res = $raw;
+    $res = str_replace(' ','_', $raw);
   }
 
   return $res;