Here’s the hacky way I figured it out:
if ( preg_match( '/<!--more-->/', $post->post_content ) ) {
$content = apply_filters( 'the_content', get_the_content( '' ) );
echo ( $content );
} else {
the_excerpt();
}
(Note that I have a separate “Read More” link after this snippet; if you’re wanting to use The Content’s default Read More link, remove the space from get_the_content();
.