sspmod_consent_Consent_Store_Cookie::_setConsentCookie(): fix assert.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3270 44740490-163a-0410-bde0-09ae8108e29a

modules/consent/lib/Consent/Store/Cookie.php

@@ -264,7 +264,7 @@ class sspmod_consent_Consent_Store_Cookie extends sspmod_consent_Store
     private function _setConsentCookie($name, $value)
     {
         assert('is_string($name)');
-        assert('is_string($value)');
+        assert('is_string($value) || is_null($value)');
 
         $globalConfig = SimpleSAML_Configuration::getInstance();
         $params = array(