Hide empty custom field from checkout cart

			if(!empty($this->extraFields['product'])) {
				$remove = [];
				$config = hikashop_config();
				$group = $config->get('group_options', 0);
				foreach($this->extraFields['product'] as $fieldname => $field) {
					$hide = true;
					foreach($products as $i => $product) {
						if(empty($product->cart_product_quantity))
							continue;
						if($group && !empty($product->cart_product_option_parent_id))
							continue;
						if(empty($product->$fieldname))
							continue;
						$hide = false;
					}
					if($hide) {
						$remove[] = $i;
					}
				}
				if(count($remove)) {
					foreach($remove as $k) {
						unset($this->extraFields['product'][$k]);
					}
				}
			}

$this->extraFields['product'] = $this->fieldClass->getFields('display:checkout=1', $products, 'product');