Display (None) instead of empty string if no Yggdrasil server is available when adding account

HMCL/src/main/java/org/jackhuang/hmcl/ui/AddAccountPane.java

@@ -82,6 +82,7 @@ public class AddAccountPane extends StackPane {
         cboServers.setCellFactory(jfxListCellFactory(server -> new TwoLineListItem(server.getName(), server.getUrl())));
         cboServers.setConverter(stringConverter(AuthlibInjectorServer::getName));
         cboServers.setItems(Settings.SETTINGS.authlibInjectorServers);
+        cboServers.setPromptText(Launcher.i18n("general.prompt.empty"));
 
         // workaround: otherwise the combox will be black
         if (!cboServers.getItems().isEmpty())

HMCL/src/main/resources/assets/lang/I18N.properties

@@ -99,6 +99,8 @@ folder.resourcepacks=Resourcepacks
 folder.saves=Saves
 folder.screenshots=Screenshots
 
+general.prompt.empty=(None)
+
 input.email=The username must be an e-mail.
 input.number=Must be a number.
 input.not_empty=Required field

HMCL/src/main/resources/assets/lang/I18N_zh_CN.properties

@@ -99,6 +99,8 @@ folder.resourcepacks=资源包文件夹
 folder.saves=存档文件夹
 folder.screenshots=截图文件夹
 
+general.prompt.empty=（无）
+
 input.email=用户名必须是邮箱
 input.number=必须是数字
 input.not_empty=必填项