test(series/sales/import/validation.robot): fix "Import a series sale with empty required field" test.

Allow to user to submit an empty field in order to be able to validate server-side validation.

Part of #1072

Author: php-coder

src/main/frontend/src/components/SeriesSaleImportForm.js

@@ -28,10 +28,6 @@ class SeriesSaleImportForm extends React.Component {
 	handleSubmit(event) {
 		event.preventDefault();
 
-		if (this.state.url == '') {
-			return;
-		}
-		
 		// @todo #1057 SeriesSaleImportForm: wait until setState() finishes
 		// (see https://reactjs.org/docs/react-component.html#setstate)
 		this.setState({

src/main/java/ru/mystamps/web/feature/site/ResourceUrl.java

@@ -32,7 +32,7 @@ public final class ResourceUrl {
 	public static final String STATIC_RESOURCES_URL = "https://stamps.filezz.ru";
 
 	// MUST be updated when any of our resources were modified
-	public static final String RESOURCES_VERSION = "v0.4.2.3";
+	public static final String RESOURCES_VERSION = "v0.4.2.4";
 
 	// CheckStyle: ignore LineLength for next 10 lines
 	private static final String CATALOG_UTILS_JS    = "/public/js/" + RESOURCES_VERSION + "/CatalogUtils.min.js";