Fix mypy issue to catch situation where we might not have a client address

app/main.py

@@ -7,7 +7,8 @@ from typing import Annotated, Optional, Union
 
 import geoip2.database
 from dotenv import load_dotenv
-from fastapi import Body, FastAPI, Path, Request, Response, status
+from fastapi import (Body, FastAPI, HTTPException, Path, Request, Response,
+                     status)
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import RedirectResponse
 from geoip2.errors import AddressNotFoundError
@@ -126,4 +127,6 @@ def root_redirect(req: Request) -> RedirectResponse:
     '''
     Redirect empty request using REMOTE_ADDR
     '''
+    if not req.client:
+        raise HTTPException(status_code=404, detail="Item not found")
     return RedirectResponse(url=str(req.url) + str(req.client.host))