fixed header tag.

__jet.cpp

@@ -10,7 +10,8 @@ namespace jet {
       if(keywordDefined("cgi") && (resolveKeyword("cgi") == "true")) {
 	 global.cgi = true;
 	 char *cookies = getenv("HTTP_COOKIE");
-	 std::cout << cookies << std::endl;
+	 if(cookies)
+	   std::cout << cookies << std::endl;
 	 
 	 if(keywordDefined("sessiondir")) {
 	    global.session = true;