[Plugin: The Events Calendar] Custom Category Display Conditional Logic Help

I am using the following code to display a specific event category in one of my site’s sidebars.

<div class="widget">
		<ul>

			<?php

			global $post;
				$all_events = tribe_get_events(
				array(
					'eventDisplay'=>'upcoming',
					'posts_per_page'=>10,
					'tax_query'=> array(
				array(
					'taxonomy' => 'tribe_events_cat',
					'field' => 'slug',
					'terms' => 'willow-creek-events'
					)
					)
				)
			);

			foreach($all_events as $post) {
			setup_postdata($post);
			?>

			<li>

			<span class="event-date" style="color:#666;"><a href="<?php the_permalink(); ?>"><?php echo tribe_get_start_date($post->ID, true, 'M j, Y'); ?></a></span>
			<br/>

			<em><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></em>

			</li>

			<?php } //endforeach ?>
			<?php wp_reset_query(); ?>
		</ul>

					<div class="dig-in" style="font-family: Georgia, Times, serif; font-style: italic; text-transform: lowercase;
		font-size: 12px; color:#ccc;">
					<a href="http://bond.pcc.edu/dev/upcoming-events/category/cascade-events/">View all events</a>
					</div>
		</div>

How could I use conditional If / Else logic to to display a default message if there is no event for the current category?

http://wordpress.org/extend/plugins/the-events-calendar/