Don't log exception if object doesn't exist (#3724)

### What problem does this PR solve?

Don't log exception if object doesn't exist. Close #1483

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/utils/minio_conn.py

@@ -1,6 +1,7 @@
 import logging
 import time
 from minio import Minio
+from minio.error import S3Error
 from io import BytesIO
 from rag import settings
 from rag.utils import singleton
@@ -84,8 +85,11 @@ def obj_exist(self, bucket, filename):
                 return True
             else:
                 return False
+        except S3Error as e:
+            if e.code in ["NoSuchKey", "NoSuchBucket", "ResourceNotFound"]:
+                return False
         except Exception:
-            logging.exception(f"Not found: {bucket}/{filename}")
+            logging.exception(f"obj_exist {bucket}/{filename} got exception")
             return False
 
     def get_presigned_url(self, bucket, fnm, expires):