Add some content to href attribute in inbox blocktype notification subject (bug #629350).

Signed-off-by: Richard Mansfield <richardm@catalyst.net.nz>

htdocs/blocktype/inbox/theme/raw/inbox.tpl

@@ -11,7 +11,7 @@
     </td>
     <td>
   {if $i->message}
-      <a href="" class="inbox-showmessage{if !$i->read} unread{/if}">{$i->subject}</a>
+      <a href="{if $i->url}{$i->url}{else}{$WWWROOT}account/activity{/if}" class="inbox-showmessage{if !$i->read} unread{/if}">{$i->subject}</a>
       <div class="inbox-message messagebody hidden" id="inbox-message-{$i->id}">{$i->message|safe}
       {if $i->url}<br><a href="{$i->url}">{if $i->urltext}{$i->urltext} &raquo;{else}{str tag="more..."}{/if}</a>{/if}
       </div>