管理员后端登录管理调整

zhijiayun-user/src/main/java/com/xuekairui/user/security/JwtAuthenticationFilter.java

@@ -240,7 +240,7 @@ public class JwtAuthenticationFilter extends OncePerRequestFilter {
     private Claims extractUidForMdcAndSetRequestAttr(String token, HttpServletRequest request) {
         Claims claims = null;
         if (token == null || token.isEmpty()) {
-            return claims;
+            return null;
         }
         try {
             claims = jwtUtil.parseTokenLenient(token);