fix(series import): when seller's url is empty don't show it as a link.

Trim empty seller.url field into null.

Fix #854

Author: php-coder

src/main/java/ru/mystamps/web/feature/series/importing/ImportSellerForm.java

@@ -29,7 +29,6 @@ public class ImportSellerForm implements AddParticipantDto {
 	// @todo #695 /series/import/request/{id}(seller.name): add validation against long values
 	private String name;
 
-	// @todo #695 /series/import/request/{id}(seller.url): trim empty values to null
 	// @todo #695 /series/import/request/{id}(seller.url): add validation for valid url
 	// @todo #695 /series/import/request/{id}(seller.url): add validation against long values
 	private String url;

src/main/java/ru/mystamps/web/feature/series/importing/SeriesImportController.java

@@ -72,6 +72,7 @@ protected void initImportSeriesForm(WebDataBinder binder) {
 		// CheckStyle: ignore LineLength for next 1 line
 		binder.registerCustomEditor(String.class, "michelNumbers", new ExpandCatalogNumbersEditor());
 		binder.registerCustomEditor(String.class, "seller.name", new StringTrimmerEditor(true));
+		binder.registerCustomEditor(String.class, "seller.url", new StringTrimmerEditor(true));
 	}
 
 	@GetMapping(SeriesImportUrl.REQUEST_IMPORT_SERIES_PAGE)