Added another “cause” exception to the new exception

Author: woutersamaey

app/code/Magento/Catalog/Model/ProductRepository.php

@@ -644,7 +644,7 @@ public function delete(ProductInterface $product)
             unset($this->instancesById[$product->getId()]);
             $this->resourceModel->delete($product);
         } catch (ValidatorException $e) {
-            throw new CouldNotSaveException(__($e->getMessage()));
+            throw new CouldNotSaveException(__($e->getMessage()), $e);
         } catch (\Exception $e) {
             throw new \Magento\Framework\Exception\StateException(
                 __('The "%1" product couldn\'t be removed.', $sku),