Merge pull request #5287 from BerriAI/litellm_fix_response_cost_cal

fix(cost_calculator.py): only override base model if custom pricing is set

litellm/proxy/auth/user_api_key_auth.py

@@ -1276,6 +1276,8 @@ def _get_request_ip_address(
         client_ip = request.headers["x-forwarded-for"]
     elif request.client is not None:
         client_ip = request.client.host
+    else:
+        client_ip = ""
 
     return client_ip