Fix exception with endpoints returning HTTP status code 204. Fixes #1891

gns3server/api/routes/controller/snapshots.py

@@ -23,7 +23,7 @@ import logging
 
 log = logging.getLogger()
 
-from fastapi import APIRouter, Depends, status
+from fastapi import APIRouter, Depends, Response, status
 from typing import List
 from uuid import UUID
 
@@ -69,12 +69,13 @@ def get_snapshots(project: Project = Depends(dep_project)) -> List[schemas.Snaps
 
 
 @router.delete("/{snapshot_id}", status_code=status.HTTP_204_NO_CONTENT)
-async def delete_snapshot(snapshot_id: UUID, project: Project = Depends(dep_project)) -> None:
+async def delete_snapshot(snapshot_id: UUID, project: Project = Depends(dep_project)) -> Response:
     """
     Delete a snapshot.
     """
 
     await project.delete_snapshot(str(snapshot_id))
+    return Response(status_code=status.HTTP_204_NO_CONTENT)
 
 
 @router.post("/{snapshot_id}/restore", status_code=status.HTTP_201_CREATED, response_model=schemas.Project)