pylxd: Use latest snapshot name if necessary

Signed-off-by: hamistao <[email protected]>

pylxd/models/storage_pool.py

@@ -780,7 +780,12 @@ def create(cls, volume, name=None, expires_at=None):
 
         # Extract the snapshot name from the response JSON in case it was not provided
         if not name:
-            name = operation.resources["storage_volume_snapshots"][0].split("/")[-1]
+            name = operation.resources.get("storage_volume_snapshots")
+            if name is not None:
+                name = name[0].split("/")[-1]
+            else:
+                # If using LXD 4.0, the snapshot name isn't provided on the request response, so grab the latest snapshot name instead.
+                name = volume.snapshots.all()[-1].split("/")[-1]
 
         snapshot = volume.snapshots.get(name)
         return snapshot