Remove empty initializer

Co-authored-by: David Brochart <[email protected]>

jupyter_ydoc/ynotebook.py

@@ -167,7 +167,7 @@ def create_ycell(self, value: Dict[str, Any]) -> Map:
                 del cell["attachments"]
         elif cell_type == "code":
             cell["outputs"] = Array(cell.get("outputs", []))
-            cell["pending_requests"] = Array([])
+            cell["pending_requests"] = Array()
 
         return Map(cell)