Fix 404 on S3 put (#651)

Author: DavidMStraub

gramps_webapi/api/resources/file.py

@@ -111,7 +111,10 @@ def put(self, args: Dict, handle: str) -> Response:
                 HTTPStatus.CONFLICT, "Uploaded file has the wrong checksum"
             )
         # we're updating an existing file
-        size_old = file_handler.get_file_size()
+        try:
+            size_old = file_handler.get_file_size()
+        except FileNotFoundError:
+            size_old = 0
         size_delta = size - size_old
         if size_delta > 0:
             check_quota_media(to_add=size_delta)

gramps_webapi/api/s3.py

@@ -121,9 +121,12 @@ def file_exists(self) -> bool:
 
     def get_file_size(self) -> int:
         """Return the file size in bytes."""
-        response = self.client.head_object(
-            Bucket=self.bucket_name, Key=self.object_name
-        )
+        try:
+            response = self.client.head_object(
+                Bucket=self.bucket_name, Key=self.object_name
+            )
+        except ClientError as exc:
+            raise FileNotFoundError from exc
         file_size = response["ContentLength"]
         return file_size