Fix: -None- option dissapeared

includes/sp-core-functions.php

@@ -846,7 +846,7 @@ if ( ! function_exists( 'sp_dropdown_taxonomies' ) ) {
 			'hide_empty'        => false,
 			'values'            => 'slug',
 			'class'             => null,
-			'property'          => null,
+			'property'          => 'none',
 			'placeholder'       => null,
 			'chosen'            => false,
 			'parent'            => 0,
@@ -982,7 +982,7 @@ if ( ! function_exists( 'sp_dropdown_pages' ) ) {
 			'post_status'       => 'publish',
 			'values'            => 'post_name',
 			'class'             => null,
-			'property'          => null,
+			'property'          => 'none',
 			'placeholder'       => null,
 			'chosen'            => false,
 			'filter'            => false,