save the custom option price when it is 0

app/code/Magento/CatalogImportExport/Model/Import/Product/Option.php

@@ -1794,7 +1794,8 @@ protected function _getSpecificTypeData(array $rowData, $optionTypeId, $defaultS
             ];
 
             $priceData = false;
-            if (!empty($rowData[self::COLUMN_ROW_PRICE])) {
+            $customOptionRowPrice = $rowData[self::COLUMN_ROW_PRICE];
+            if (!empty($customOptionRowPrice) || $customOptionRowPrice === '0') {
                 $priceData = [
                     'price' => (double)rtrim($rowData[self::COLUMN_ROW_PRICE], '%'),
                     'price_type' => 'fixed',

dev/tests/integration/testsuite/Magento/CatalogImportExport/Model/Import/ProductTest.php

@@ -431,7 +431,7 @@ public function getBehaviorDataProvider(): array
             'Append behavior with new product' => [
                 'importFile' => 'product_with_custom_options_new.csv',
                 'sku' => 'simple_new',
-                'expectedOptionsQty' => 4,
+                'expectedOptionsQty' => 5,
             ],
         ];
     }

dev/tests/integration/testsuite/Magento/CatalogImportExport/Model/Import/_files/product_with_custom_options_new.csv

@@ -1,2 +1,2 @@
 sku,store_view_code,attribute_set_code,product_type,categories,product_websites,name,description,short_description,weight,product_online,tax_class_name,visibility,price,special_price,special_price_from_date,special_price_to_date,url_key,meta_title,meta_keywords,meta_description,base_image,base_image_label,small_image,small_image_label,thumbnail_image,thumbnail_image_label,created_at,updated_at,new_from_date,new_to_date,display_product_options_in,map_price,msrp_price,map_enabled,gift_message_available,custom_design,custom_design_from,custom_design_to,custom_layout_update,page_layout,product_options_container,msrp_display_actual_price_type,country_of_manufacture,additional_attributes,qty,out_of_stock_qty,use_config_min_qty,is_qty_decimal,allow_backorders,use_config_backorders,min_cart_qty,use_config_min_sale_qty,max_cart_qty,use_config_max_sale_qty,is_in_stock,notify_on_stock_below,use_config_notify_stock_qty,manage_stock,use_config_manage_stock,use_config_qty_increments,qty_increments,use_config_enable_qty_inc,enable_qty_increments,is_decimal_divided,website_id,related_skus,crosssell_skus,upsell_skus,additional_images,additional_image_labels,hide_from_product_page,custom_options,bundle_price_type,bundle_sku_type,bundle_price_view,bundle_weight_type,bundle_values,associated_skus
-simple_new,,Default,simple,,base,"New Product",,,,1,"Taxable Goods","Catalog, Search",10.0000,,,,new-product,"New Product","New Product","New Product ",,,,,,,"2015-10-20 07:05:38","2015-10-20 07:05:38",,,"Block after Info Column",,,,,,,,,,,,,"has_options=1,quantity_and_stock_status=In Stock,required_options=1",100.0000,0.0000,1,0,0,1,1.0000,1,10000.0000,1,1,1.0000,1,1,0,1,1.0000,0,0,0,1,,,,,,,"name=New Radio,type=radio,required=1,price=3.0000,price_type=fixed,sku=4-1-radio,option_title=Option 1|name=New Radio,type=radio,required=1,price=3.0000,price_type=fixed,sku=4-2-radio,option_title=Option 2|name=New Select,type=drop_down,required=1,price=3.0000,price_type=fixed,sku=3-1-select,option_title=Option 1|name=New Select,type=drop_down,required=1,price=3.0000,price_type=fixed,sku=3-2-select,option_title=Option2|name=Test Date and Time Title,type=date_time,required=1,price=2.0000,price_type=fixed,sku=2-date|name=Test Field Title,type=field,required=1,price=0.0000,price_type=fixed,sku=1-text,max_characters=10",,,,,,
+simple_new,,Default,simple,,base,"New Product",,,,1,"Taxable Goods","Catalog, Search",10.0000,,,,new-product,"New Product","New Product","New Product ",,,,,,,"2015-10-20 07:05:38","2015-10-20 07:05:38",,,"Block after Info Column",,,,,,,,,,,,,"has_options=1,quantity_and_stock_status=In Stock,required_options=1",100.0000,0.0000,1,0,0,1,1.0000,1,10000.0000,1,1,1.0000,1,1,0,1,1.0000,0,0,0,1,,,,,,,"name=New Radio,type=radio,required=1,price=3.0000,price_type=fixed,sku=4-1-radio,option_title=Option 1|name=New Radio,type=radio,required=1,price=3.0000,price_type=fixed,sku=4-2-radio,option_title=Option 2|name=New Select,type=drop_down,required=1,price=3.0000,price_type=fixed,sku=3-1-select,option_title=Option 1|name=New Select,type=drop_down,required=1,price=3.0000,price_type=fixed,sku=3-2-select,option_title=Option2|name=Test Date and Time Title,type=date_time,required=1,price=2.0000,price_type=fixed,sku=2-date|name=Test Field Title,type=field,required=1,price=0.0000,price_type=fixed,sku=1-text,max_characters=10|name=New Select With Zero Price,type=drop_down,required=1,price=0,price_type=fixed,sku=3-1-select,option_title=Option 1",,,,,,