优化用户token验证

src/main/java/com/example/catchTheLetters/controller/AuthController.java

@@ -42,7 +42,8 @@ public class AuthController {
     @ApiOperation(value = "验证token（不会返回密码）")
     @GetMapping("/verify")
     public R<UserVo> verify(@RequestHeader("token") String token) {
-        return R.ok(authService.verify(token).toVo());
+        var user = authService.verify(token);
+        return user == null ? R.fail() : R.ok(user.toVo());
     }
 
     @ApiOperation(value = "用户注册")