fixing a fault on empty user email when asking a question
fixing a fault on empty user email when asking a question

see http://forum.phpmyfaq.de/viewtopic.php?f=3&t=9924

rogeriopradoj/phpMyFAQ-vagrant,Chris--A/phpMyFAQ,thorsten/phpMyFAQ,Chris--A/phpMyFAQ,brianjking/phpMyFAQ,brianjking/phpMyFAQ,thorsten/phpMyFAQ,rogeriopradoj/phpMyFAQ-vagrant,rogeriopradoj/phpMyFAQ-vagrant,brianjking/phpMyFAQ,thorsten/phpMyFAQ,brianjking/phpMyFAQ,Chris--A/phpMyFAQ,thorsten/phpMyFAQ,Chris--A/phpMyFAQ,rogeriopradoj/phpMyFAQ-vagrant