Piwik\Plugin\Visualization::removeEmptyColumnsFromDisplay PHP Method

    private function removeEmptyColumnsFromDisplay()
    {
        if ($this->dataTable instanceof DataTable\Map) {
            $emptyColumns = $this->dataTable->getMetadataIntersectArray(DataTable::EMPTY_COLUMNS_METADATA_NAME);
        } else {
            $emptyColumns = $this->dataTable->getMetadata(DataTable::EMPTY_COLUMNS_METADATA_NAME);
        }
        if (is_array($emptyColumns)) {
            foreach ($emptyColumns as $emptyColumn) {
                $key = array_search($emptyColumn, $this->config->columns_to_display);
                if ($key !== false) {
                    unset($this->config->columns_to_display[$key]);
                }
            }
            $this->config->columns_to_display = array_values($this->config->columns_to_display);
        }
    }