Update datums.py

node/datums.py

@@ -57,7 +57,12 @@ class CFSubDatum:
                  net: CFNet | None = None):
         self._parent_datum = parent_datum
         self._origin_sub_datum = sub_datum
-        self.hash = str(sub_datum.hash)
+        if parent_datum:
+            self.hash = str(parent_datum.hash)
+        else:
+            log.warning(f"SubDatum created with no parent datum, no hash provided")
+            self.hash = None
+
         self.type = "DEFAULT"
 
         if self._parent_datum and self._parent_datum.atom is None:  # mempool datum