Added filter to remove Genesis default image fallback of first-attached.

functions.php

@@ -84,6 +84,9 @@ function trestle_theme_setup() {
 	// Manually control where Post Info & Meta display
 	add_action( 'the_post', 'trestle_post_info_meta', 0 );
 
+	// Remove default featured image fallback of 'first-attached'
+	add_filter( 'genesis_get_image_default_args', 'trestle_featured_image_fallback' );
+
 
 	/*===========================================
 	 * General Actions & Filters

lib/functions/theme-functions.php

@@ -261,6 +261,23 @@ function trestle_post_info_meta() {
 	}
 }
 
+/**
+ * Unset Genesis default featured image fallback of 'first-attached'
+ *
+ * This function prevents Genesis' default behavior of displaying
+ * the 'first-attached' image as a post's featured image (in archive)
+ * views, even when the post has no current featured image.
+ *
+ * @since 1.0.0
+ *
+ * @param array $args Default Genesis image args
+ * @return array Updated image args
+ */
+function trestle_featured_image_fallback( $args ) {
+	$args['fallback'] = false;
+	return $args;
+}
+
 
 /*===========================================
  * General Actions & Filters