Option to refresh a chart "Live" is not allowed to be saved with "Import from WordPress"

Author: contactashish13

classes/Visualizer/Module/Chart.php

@@ -1401,7 +1401,7 @@ public function saveFilter() {
 			)
 		);
 
-		if ( ! $hours ) {
+		if ( 0 !== $hours && empty( $hours ) ) {
 			$hours = -1;
 		}