Fixes #876: Handled pricebook selection when line-item is not in it

modules/PriceBooks/actions/ProductListPrice.php

@@ -25,6 +25,7 @@ class PriceBooks_ProductListPrice_Action extends Vtiger_Action_Controller {
 		$moduleModel = $request->getModule();
 		$priceBookModel = Vtiger_Record_Model::getInstanceById($recordId, $moduleModel);
 		$listPrice = $priceBookModel->getProductsListPrice($request->get('itemId'));
+		if (empty($listPrice)) $listPrice = 0; /* Selected product not in pricebook */
 
 		$response = new Vtiger_Response();
 		$response->setResult(array($listPrice));