Fix: error when user balance is zero and no remaining executions to r… (

#661)

Fix: error when user balance is zero and no remaining executions to remove

src/aleph/vm/orchestrator/tasks.py

@@ -158,7 +158,7 @@ async def monitor_payments(app: web.Application):
  required_balance = await compute_required_balance(executions)
  logger.debug(f"Required balance for Sender {sender} executions: {required_balance}")
  # Stop executions until the required balance is reached
- while balance < (required_balance + settings.PAYMENT_BUFFER):
+ while executions and balance < (required_balance + settings.PAYMENT_BUFFER):
  last_execution = executions.pop(-1)
  logger.debug(f"Stopping {last_execution} due to insufficient balance")
  await pool.stop_vm(last_execution.vm_hash)