BE: fix test error

Author: seono

api/src/main/java/io/kafbat/ui/service/rbac/AccessControlService.java

@@ -162,6 +162,9 @@ public static Mono<AuthenticatedUser> getUser() {
 
   private boolean isClusterAccessible(String clusterName, AuthenticatedUser user) {
     Assert.isTrue(StringUtils.isNotEmpty(clusterName), "cluster value is empty");
+    if (properties.getDefaultRole() != null) {
+      return true;
+    }
     return properties.getRoles()
         .stream()
         .filter(filterRole(user))

api/src/test/java/io/kafbat/ui/service/rbac/AccessControlServiceDefaultRoleRbacEnabledTest.java

@@ -62,6 +62,7 @@ void setUp() {
     RoleBasedAccessControlProperties properties = mock();
     defaultRole = MockedRbacUtils.getDefaultRole();
     when(properties.getDefaultRole()).thenReturn(defaultRole);
+    when(properties.getRoles()).thenReturn(List.of()); // Return empty list for roles
 
 
     ReflectionTestUtils.setField(accessControlService, "properties", properties);