fix model

Author: Enaium

src/main/java/cn/enaium/joe/gui/panel/MemberListPanel.java

@@ -46,7 +46,7 @@
 public class MemberListPanel extends BorderPanel {
     public MemberListPanel() {
 
-        JList<Pair<ClassNode, Object>> memberList = new JList<>();
+        JList<Pair<ClassNode, Object>> memberList = new JList<>(new DefaultListModel<>());
 
         memberList.addMouseListener(new MouseAdapter() {
             @Override