add check user state

src/api/admin.rs

@@ -439,6 +439,11 @@ async fn remove_2fa(uuid: String, _token: AdminToken, mut conn: DbConn) -> Empty
 #[post("/users/<uuid>/invite/resend")]
 async fn resend_user_invite(uuid: String, _token: AdminToken, mut conn: DbConn) -> EmptyResult {
     if let Some(user) = User::find_by_uuid(&uuid, &mut conn).await {
+        //TODO: replace this with user.status check when it will be available (PR#3397)
+        if !user.password_hash.is_empty() {
+            err_code!("User already accepted invitation", Status::BadRequest.code);
+        }
+
         if CONFIG.mail_enabled() {
             mail::send_invite(&user.email, &user.uuid, None, None, &CONFIG.invitation_org_name(), None).await
         } else {