Fix set_space_volume / delete_space_volume return types (#4061)

* fix: parse Space volumes mutation response or fetch runtime

PUT/DELETE /spaces/.../volumes may return JSON without a top-level stage.
HfApi.set_space_volumes and delete_space_volumes now fall back to
get_space_runtime when the body is empty or not a full runtime payload.

Made-with: Cursor

* refactor: parse SpaceRuntime from mutation response with try/except fallback

Made-with: Cursor

* test: collapse Space volumes mutation tests into one case

Made-with: Cursor

* test: keep single Space volumes regression (non-runtime JSON payload)

Made-with: Cursor

* just return None

---------

Co-authored-by: Lucain Pouget <lucainp@gmail.com>

Author: abidlabs

src/huggingface_hub/hf_api.py

@@ -8165,7 +8165,7 @@ def set_space_volumes(
         volumes: list[Volume],
         *,
         token: bool | str | None = None,
-    ) -> SpaceRuntime:
+    ) -> None:
         """Set volumes for a Space.
 
         Sets (or replaces) the list of volumes mounted in the Space. Each volume gives the Space's container access
@@ -8184,9 +8184,6 @@ def set_space_volumes(
                 https://huggingface.co/docs/huggingface_hub/quick-start#authentication).
                 To disable authentication, pass `False`.
 
-        Returns:
-            [`SpaceRuntime`]: Runtime information about a Space including Space stage and hardware.
-
         Raises:
             [`BadRequestError`]:
                 If the Space is a static Space (volumes are not supported on static Spaces).
@@ -8211,15 +8208,14 @@ def set_space_volumes(
             json=payload,
         )
         hf_raise_for_status(r)
-        return SpaceRuntime(r.json())
 
     @validate_hf_hub_args
     def delete_space_volumes(
         self,
         repo_id: str,
         *,
         token: bool | str | None = None,
-    ) -> SpaceRuntime:
+    ) -> None:
         """Remove all volumes from a Space.
 
         Args:
@@ -8231,9 +8227,6 @@ def delete_space_volumes(
                 https://huggingface.co/docs/huggingface_hub/quick-start#authentication).
                 To disable authentication, pass `False`.
 
-        Returns:
-            [`SpaceRuntime`]: Runtime information about a Space including Space stage and hardware.
-
         Raises:
             [`BadRequestError`]:
                 If the Space has no volumes attached.
@@ -8250,7 +8243,6 @@ def delete_space_volumes(
             headers=self._build_hf_headers(token=token),
         )
         hf_raise_for_status(r)
-        return SpaceRuntime(r.json())
 
     #######################
     # Inference Endpoints #