Corrige validação de campos opcionais

public/class-cf7-states-cities-public.php

@@ -274,7 +274,7 @@ class Cf7_States_Cities_Public {
 			$result->invalidate( $tag, wpcf7_get_message( 'invalid_required' ) );
 		}
 
-		if ( $tag->type === 'state' || $tag->type === 'state*' ) {
+		if ( !$empty && ( $tag->type === 'state' || $tag->type === 'state*' ) ) {
 			$states = require( plugin_dir_path( __FILE__ ) . '../data/states.php' );
 
 			if ( !in_array( $_POST[$name], $states ) ) {
@@ -282,7 +282,7 @@ class Cf7_States_Cities_Public {
 			}
 		}
 
-		if ( $tag->type === 'city' || $tag->type === 'city*' ) {
+		if ( !$empty && ( $tag->type === 'city' || $tag->type === 'city*' ) ) {
 			$cities = require( plugin_dir_path( __FILE__ ) . '../data/cities.php' );
 
 			if ( !in_array( $_POST[$name], $cities ) ) {