issue: Client Side Column Sorting

This addresses an issue where client side column sorting does not work at
all. This is due to the if/else statement that checks for a REQUEST sort
order and if the REQUEST sort order matches an `$orderWays` array value. The
if statement returns TRUE for DESC and sets the sort order to DESC as it
equals '-' (a dash) but ASC equals '' (an empty string) so it returns FALSE
which fails-over to the else statement setting the sort order to DESC. In
addition, this adds sorting icons the the column headers to make it more
obvious they are sortable.

include/client/tickets.inc.php

@@ -47,7 +47,7 @@ if($sort && $sortOptions[$sort])
     $order_by =$sortOptions[$sort];
 
 $order_by=$order_by ?: $sortOptions['date'];
-if ($_REQUEST['order'] && $orderWays[strtoupper($_REQUEST['order'])])
+if ($_REQUEST['order'] && !is_null($orderWays[strtoupper($_REQUEST['order'])]))
     $order = $orderWays[strtoupper($_REQUEST['order'])];
 else
     $order = $orderWays['DESC'];
@@ -205,19 +205,19 @@ if ($closedTickets) {?>
     <thead>
         <tr>
             <th nowrap>
-                <a href="tickets.php?sort=ID&order=<?php echo $negorder; ?><?php echo $qstr; ?>" title="Sort By Ticket ID"><?php echo __('Ticket #');?></a>
+                <a href="tickets.php?sort=ID&order=<?php echo $negorder; ?><?php echo $qstr; ?>" title="Sort By Ticket ID"><?php echo __('Ticket #');?><i class="icon-sort"></i></a>
             </th>
             <th width="120">
-                <a href="tickets.php?sort=date&order=<?php echo $negorder; ?><?php echo $qstr; ?>" title="Sort By Date"><?php echo __('Create Date');?></a>
+                <a href="tickets.php?sort=date&order=<?php echo $negorder; ?><?php echo $qstr; ?>" title="Sort By Date"><?php echo __('Create Date');?><i class="icon-sort"></i></a>
             </th>
             <th width="100">
-                <a href="tickets.php?sort=status&order=<?php echo $negorder; ?><?php echo $qstr; ?>" title="Sort By Status"><?php echo __('Status');?></a>
+                <a href="tickets.php?sort=status&order=<?php echo $negorder; ?><?php echo $qstr; ?>" title="Sort By Status"><?php echo __('Status');?><i class="icon-sort"></i></a>
             </th>
             <th width="320">
-                <a href="tickets.php?sort=subj&order=<?php echo $negorder; ?><?php echo $qstr; ?>" title="Sort By Subject"><?php echo __('Subject');?></a>
+                <a href="tickets.php?sort=subj&order=<?php echo $negorder; ?><?php echo $qstr; ?>" title="Sort By Subject"><?php echo __('Subject');?><i class="icon-sort"></i></a>
             </th>
             <th width="120">
-                <a href="tickets.php?sort=dept&order=<?php echo $negorder; ?><?php echo $qstr; ?>" title="Sort By Department"><?php echo __('Department');?></a>
+                <a href="tickets.php?sort=dept&order=<?php echo $negorder; ?><?php echo $qstr; ?>" title="Sort By Department"><?php echo __('Department');?><i class="icon-sort"></i></a>
             </th>
         </tr>
     </thead>