Update desc; safe check

Author: PatelUtkarsh

plugin/php/customizer/class-controls.php

@@ -139,7 +139,7 @@ public function add_sections() {
 			'global-setting' => [
 				'label'       => __( 'Global Styles', 'material-design' ),
 				'priority'    => 300,
-				'description' => esc_html__( 'Global style change will affect all the blocks used in your pages. This may override styles applied to blocks locally.', 'material-design' ),
+				'description' => esc_html__( 'Global styles will be applied to any new and existing static block using the default style. This will not affect any local style overrides for supported blocks.', 'material-design' ),
 			],
 		];
 

theme/functions.php

@@ -203,7 +203,10 @@ function material_is_plugin_active() {
  */
 function get_material_global_style( $key ) {
 	if ( material_is_plugin_active() ) {
-		return \MaterialDesign\Plugin\get_plugin_instance()->block_types->get_global_styles( $key );
+		$instance = \MaterialDesign\Plugin\get_plugin_instance();
+		if ( property_exists( $instance, 'block_types' ) && method_exists( $instance->block_types, 'get_global_styles' ) ) {
+			return $instance->block_types->get_global_styles( $key );
+		}
 	}
 	return '';
 }