uri_parser: check boundaries if host is empty, but userinfo exists
uri_parser: check boundaries if host is empty, but userinfo exists

miri64/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,ant9000/RIOT,jasonatran/RIOT,jasonatran/RIOT,kaspar030/RIOT,jasonatran/RIOT,kaspar030/RIOT,OlegHahm/RIOT,authmillenon/RIOT,OlegHahm/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,miri64/RIOT,OTAkeys/RIOT,kaspar030/RIOT,OlegHahm/RIOT,ant9000/RIOT,OlegHahm/RIOT,miri64/RIOT,ant9000/RIOT,kaspar030/RIOT,authmillenon/RIOT,kaspar030/RIOT,miri64/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,miri64/RIOT,kYc0o/RIOT,OTAkeys/RIOT,kYc0o/RIOT,kYc0o/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,ant9000/RIOT,ant9000/RIOT,jasonatran/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,authmillenon/RIOT,authmillenon/RIOT