fix RemoteStore.empty

Author: rabernat

src/zarr/storage/remote.py

@@ -96,7 +96,10 @@ async def clear(self) -> None:
     async def empty(self) -> bool:
         # TODO: it would be nice if we didn't have to list all keys here
         # it should be possible to stop after the first key is discovered
-        return not await self.fs._ls(self.path)
+        try:
+            return not await self.fs._ls(self.path)
+        except FileNotFoundError:
+            return True
 
     def with_mode(self, mode: AccessModeLiteral) -> Self:
         return type(self)(