Fix empty delays in script helper (#114346)
fixes
```
Logger: homeassistant.components.automation.kamermaster_knop_4_acties_licht
Bron: components/automation/__init__.py:726
integratie: Automatisering (documentatie, problemen)
Eerst voorgekomen: 22:17:29 (5 gebeurtenissen)
Laatst gelogd: 22:59:24
While executing automation automation.kamermaster_knop_4_acties_licht
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/components/automation/__init__.py", line 726, in async_trigger
return await self.action_script.async_run(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 1645, in async_run
return await asyncio.shield(create_eager_task(run.async_run()))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 454, in async_run
await self._async_step(log_exceptions=False)
File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 506, in _async_step
self._handle_exception(
File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 536, in _handle_exception
raise exception
File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 504, in _async_step
await getattr(self, handler)()
File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 626, in _async_delay_step
if timeout_future.done():
^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'done'
```
f4922edb4b