Update components/com_kunena/template/blue_eagle/html/user/default_tab.php

- fixed wrong placed endif that caused the creation of an URL with an empty hostname if the user has not specified a website in his profile
- added additional if-clause to prevent an empty <ul></ul>
Merge pull request #1427 from steppo/master

K2.0 blue_eagle template: URL with empty hostname in profile view