fix：商城小程序用户登录bug修复

fs-user-app/src/main/java/com/fs/app/controller/store/WxUserScrmController.java

@@ -307,7 +307,7 @@ public class WxUserScrmController extends AppBaseController {
                     //写入
                     user=new FsUserScrm();
                     user.setPhone(phoneNoInfo.getPhoneNumber());
-                    user.setNickName("微信用户"+phoneNoInfo.getPhoneNumber().substring(phoneNoInfo.getPhoneNumber().length()-4));
+                    user.setNickName(phoneNoInfo.getPhoneNumber() != null ? "微信用户" + phoneNoInfo.getPhoneNumber().substring(phoneNoInfo.getPhoneNumber().length()-4) : "微信用户");
                     user.setAvatar("https://hos-1309931967.cos.ap-chongqing.myqcloud.com/fs/20230725/a848605591384ec29d49773dd58d9345.jpg");
                     user.setStatus(1);
                     user.setMaOpenId(session.getOpenid());