Code to Detect Widgets in Sidebar

I need the code to detect if a widget is in a sidebar or not the code to detect sidebars is:

<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('sidebarPageInnerRight') ) : ?>
 I NEED CODE HERE TO DETECT A WIDGET
<td id="right-inner">
</td>
<?php endif; ?>

Is it possible to add code to the noted section above to determine whether a widget has been placed onto the sidebar in the Widgets section of WordPress?

The reason I need this is so the <td> column won’t take the space if there are no widgets loaded into the sidebar.

Thanks for your help.