Get Featured Image with Fall back for blank image.

wp-get-featured-image.php

// GET FEATURED IMAGE
function hg_get_featured_image( $id, $size = 'post-thumbnail', $allow_empty = false )
{
	$rtn = false;
	
	// TRY FEATURED IMAGE
	$featured_image = wp_get_attachment_image_src( get_post_thumbnail_id( $id ), $size );
	

	// IF NOT GET FIRST IMAGE ATTACHMENT FROM POST
	if(!$featured_image)
	{
		$attachments = get_children( array( 'post_parent' => $id, 'post_type' => 'attachment', 'post_mime_type' => 'image', 'posts_per_page' => 1, 'orderby' => 'menu_order ASC, ID', 'order' => 'DESC') );
		
		if($attachments)
		{
			$first_attachment = reset($attachments);
			$featured_image = wp_get_attachment_image_src( $first_attachment->ID, $size );
		}
	}
	
	
	// IF FEATURED IMAGE GET THE SRC
	if($featured_image) 
	{
		$rtn = $featured_image[0];
	}
	
	
	// IF NOT RETURN DATA GET NO IMAGE
	if($rtn == "" && !$allow_empty)
	{ 
		$rtn = get_template_directory_uri() . "/images/no-image.jpg";
	}	
	
	return $rtn;
}