upgrade: Fix nasty message in footer on 1.6

This happens when upgrading from 1.6, the company information does not yet
exist (neither do the form tables)

Properly escape company name for display

include/class.company.php

@@ -60,7 +60,11 @@ class Company {
     }
 
     function __toString() {
-        return $this->getName();
+        try {
+            if ($name = $this->getForm()->getAnswer('name'))
+                return $name->display();
+        } catch (Exception $e) {}
+        return '';
     }
 
     /**

include/client/footer.inc.php

         </div>
     </div>
     <div id="footer">
-        <p>Copyright &copy; <?php echo date('Y'); ?> <?php echo $ost->company ?: 'osTicket.com'; ?> - All rights reserved.</p>
+        <p>Copyright &copy; <?php echo date('Y'); ?> <?php echo (string) $ost->company :? 'osTicket.com'; ?> - All rights reserved.</p>
         <a id="poweredBy" href="http://osticket.com" target="_blank">Helpdesk software - powered by osTicket</a>
     </div>
 <div id="overlay"></div>

include/staff/footer.inc.php

     </div>
     <div id="footer">
-        Copyright &copy; 2006-<?php echo date('Y'); ?>&nbsp;<?php echo $ost->company ?: 'osTicket.com'; ?>&nbsp;All Rights Reserved.
+        Copyright &copy; 2006-<?php echo date('Y'); ?>&nbsp;<?php echo (string) $ost->company ?: 'osTicket.com'; ?>&nbsp;All Rights Reserved.
     </div>
 <?php
 if(is_object($thisstaff) && $thisstaff->isStaff()) { ?>