Fix #6969: 修复第二次打开游戏下载页面时页面空白的问题 (#6988)

HMCL/src/main/java/org/jackhuang/hmcl/ui/download/VersionsPage.java

@@ -69,7 +69,6 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.Locale;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 import static org.jackhuang.hmcl.ui.FXUtils.*;
@@ -406,6 +405,8 @@ public final class VersionsPage extends Control implements WizardPage, Refreshab
                         VBox.setVgrow(list, Priority.ALWAYS);
 
                         control.versions.addListener((InvalidationListener) o -> updateList());
+                        if (!control.versions.isEmpty())
+                            updateList();
 
                         list.setCellFactory(listView -> new RemoteVersionListCell(control));
 
@@ -493,7 +494,7 @@ public final class VersionsPage extends Control implements WizardPage, Refreshab
             }
 
             //noinspection DataFlowIssue
-            list.getItems().setAll(versions.collect(Collectors.toList()));
+            list.getItems().setAll(versions.toList());
             list.scrollTo(0);
         }
     }