Return default ETag if fs.json is empty (#6787)

cmd/fs-v1.go

@@ -719,9 +719,13 @@ func (fs *FSObjects) getObjectInfo(ctx context.Context, bucket, object string) (
 		// Read from fs metadata only if it exists.
 		_, rerr := fsMeta.ReadFrom(ctx, rlk.LockedFile)
 		fs.rwPool.Close(fsMetaPath)
-		if rerr != nil && rerr != io.EOF {
+		if rerr != nil {
+			if rerr != io.EOF {
 				return oi, rerr
 			}
+			// Set Default ETag, if fs.json is empty
+			fsMeta = fs.defaultFsJSON(object)
+		}
 	}
 
 	// Return a default etag and content-type based on the object's extension.