Revert "Make Travis happy"

This reverts commit 4f58b0ec.

lib/SimpleSAML/Utils/HTTP.php

@@ -756,8 +756,6 @@ class HTTP
         $cfg = \SimpleSAML_Configuration::getInstance();
         $baseDir = $cfg->getBaseDir();
         $cur_path = realpath($_SERVER['SCRIPT_FILENAME']);
-        // althought very unlikely, realpath() could return false and Travis doesn't like that idea
-        assert(is_string($cur_path));
         // find the path to the current script relative to the www/ directory of SimpleSAMLphp
         $rel_path = str_replace($baseDir.'www'.DIRECTORY_SEPARATOR, '', $cur_path);
         // convert that relative path to an HTTP query