Avoid breaking with ChartJS

Added a check to stop the Block from breaking with ChartJS until proper
support is added. Related to #373

Author: HardeepAsrani

classes/Visualizer/Gutenberg/Block.php

@@ -194,6 +194,8 @@ public function get_visualizer_data( $post ) {
 
 		$data['visualizer-chart-type'] = get_post_meta( $post_id, Visualizer_Plugin::CF_CHART_TYPE, true );
 
+		$data['visualizer-chart-library'] = get_post_meta( $post_id, Visualizer_Plugin::CF_CHART_LIBRARY, true );
+
 		$data['visualizer-source'] = get_post_meta( $post_id, Visualizer_Plugin::CF_SOURCE, true );
 
 		$data['visualizer-default-data'] = get_post_meta( $post_id, Visualizer_Plugin::CF_DEFAULT_DATA, true );