Prepare withdraw routes part of the HP managament

Requires: !306 (merged)

clive/__private/ui/operations/hive_power_management/withdraw_routes/withdraw_routes.py

@@ -130,7 +130,8 @@ class WithdrawRoutes(TabPane, OperationActionBindings):
             yield WithdrawRoutesTable()
 
     def _create_operation(self) -> SetWithdrawVestingRouteOperation | None:
-        CliveValidatedInput.validate_many(self._account_input, self._percent_input)
+        if not CliveValidatedInput.validate_many(self._account_input, self._percent_input):
+            return None
 
         return SetWithdrawVestingRouteOperation(
             from_account=self.working_account,