Display 'Change Address' button even if there are no shipping methods declared

always_display_change_address_button.php

<?php
function always_show_edit_address_subscription_action( $actions, $subscription ) {

		if ( $subscription->has_status( array( 'active', 'on-hold' ) ) ) {
			$actions['change_address'] = array(
				'url'  => add_query_arg( array( 'subscription' => $subscription->get_id() ), wc_get_endpoint_url( 'edit-address', 'shipping' ) ),
				'name' => __( 'Change Address', 'woocommerce-subscriptions' ),
			);
		}

		return $actions;
	}
add_filter( 'wcs_view_subscription_actions', 'always_show_edit_address_subscription_action', 11, 2 );