Conditional thumbnail if else statement

I've tried my best to scour the net and find the solution as to why this isn't working. The goal I am attempting to accomplish is to have the Loop use the featured image thumbnail if the post thumbnail equals NULL. Currently the code is as follows:

 <?php if (is_category('News') && is_tag('Anime') &&  has_post_thumbnail()){ 
                    the_post_thumbnail('homepage-thumb');
                }
            if (class_exists('MultiPostThumbnails')) : 
                MultiPostThumbnails::the_post_thumbnail(
                    get_post_type(),
                    'post-image',
                    NULL,
                    'homepage-thumb');
            endif;
        ?>

Thanks in advance for any help you can give me.