You need to make 2 changes:
1) In file qa-include/qa-db-selects.php (Replace function qa_db_unanswered_qs_selectspec with the following):
function qa_db_unanswered_qs_selectspec($voteuserid, $start, $categoryslugs=null, $hidden=false, $full=false, $count=QA_DB_RETRIEVE_QS_AS, $answeredOnly=false)
/*
Return the selectspec to retrieve $count recent unanswered ($hidden or not) questions,
starting from offset $start, restricted to the category for $categoryslugs (if not null),
with the corresponding vote made by $voteuserid (if not null) and including $full content or not
*/
{
$selectspec=qa_db_posts_basic_selectspec($voteuserid, $full);
$acount = ($answeredOnly ? "acount>0" : "acount=0");
$selectspec['source'].=" JOIN (SELECT postid FROM ^posts WHERE ".qa_db_categoryslugs_sql($categoryslugs)."type=$ AND ".$acount." ORDER BY ^posts.created DESC LIMIT #,#) y ON ^posts.postid=y.postid";
array_push($selectspec['arguments'], $hidden ? 'Q_HIDDEN' : 'Q', $start, $count);
$selectspec['sortdesc']='created';
return $selectspec;
}
2) In file qa-include/qa-page-unanswered.php:
Replace this line:
qa_db_unanswered_qs_selectspec($qa_login_userid, $qa_start, null, false, false, QA_DB_RETRIEVE_QS_AS)
With my code :
qa_db_unanswered_qs_selectspec($qa_login_userid, $qa_start, null, false, false, QA_DB_RETRIEVE_QS_AS, true)
NOTE:
In this way you will make Unanswered questions act as Answered questions. To make both Unanswered and Answered pages work. You need to do some more simple core changes.