fix image meta

single.php

@@ -9,8 +9,10 @@
 						<time class="updated" datetime="<?php the_time('c');?>" itemprop="datePublished"><?php the_time('n/j/Y'); ?></time>
 					</div>			
 						<span class="vcard author"><span class="fn">David A. Windham</span></span>
-						<?php $img_url = wp_get_attachment_image_src(get_post_thumbnail_id(),'thumbnail'); ?>
-						<img itemprop="image" src="<?php echo $img_url[0];?>" alt="thumbnail" style="display:none"/>
+						<?php $img_url = wp_get_attachment_image_src(get_post_thumbnail_id(),'studio'); ?>
+						<?php if ( $img_url ) : ?>
+							<img itemprop="image" src="<?php echo $img_url[0];?>" alt="thumbnail" style="display:none"/>
+						<?php endif; ?>
 					<h2 itemprop="name headline" class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'daw' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h2>
 					<?php the_content(); ?>
 					<?php comments_template( '', true ); ?>