Gutenberg Blocks Support

Since support for Gutenberg blocks was added in 3.8.0 sites still using WP <5 are now breaking as there is no register_block_type function.

Adding an if statement round the link in the __construct function in Blocks.php checking for the existence of this function would rectify this.

public function __construct() {
		add_filter( 'block_categories', [ $this, 'register_block_categories' ], 10, 2 );
		add_action( 'init', [ $this, 'register_scripts' ] );
		if ( function_exists( 'register_block_type' ) ) {
			add_action( 'init', [ $this, 'register_blocks' ] );
		}

		add_action( 'wp_ajax_vczapi_get_zoom_hosts', [ $this, 'get_hosts' ] );
		add_action( 'wp_ajax_vczapi_get_live_meetings', [ $this, 'get_live_meetings' ] );
	}

Cheers
Greg