You can try "interpolateNulls" option in case some of your values are null:

    // MyReport.view.php
    LineChart::create(array(
        ...
        "options" => array(
            "interpolateNulls" => true,
            ...
        ),
    ));

If you want to skip 0 values as well, convert 0 to null with Map process:

    // MyReport.php
    ->pipe(new \koolreport\processes\Map(array(
        "{value}" => function($row) {
            foreach ($row as $k => $v) {
               if ($v === 0) $row[$k] = null;
            }
            return $row;
        }
    )))