Fix console error #1014

Author: girishpanchal30

classes/Visualizer/Module/Wizard.php

@@ -289,6 +289,7 @@ private function setup_wizard_import_chart() {
 					),
 					'focusTarget'     => 'datum',
 					'series'          => $setting_series,
+					'slices'          => array(),
 					'vAxis'           => array(
 						'title'          => '',
 						'textPosition'   => '',