Fix calling empty script turn off (#24827)

homeassistant/components/script/__init__.py

@@ -79,9 +79,14 @@ async def async_setup(hass, config):
     async def turn_off_service(service):
         """Cancel a script."""
         # Stopping a script is ok to be done in parallel
+        scripts = await component.async_extract_from_service(service)
+
+        if not scripts:
+            return
+
         await asyncio.wait([
             script.async_turn_off() for script
-            in await component.async_extract_from_service(service)
+            in scripts
         ])
 
     async def toggle_service(service):

tests/components/script/test_init.py

@@ -322,3 +322,13 @@ async def test_logging_script_error(hass, caplog):
     assert err.value.domain == 'non'
     assert err.value.service == 'existing'
     assert 'Error executing script' in caplog.text
+
+
+async def test_turning_no_scripts_off(hass):
+    """Test it is possible to turn two scripts off."""
+    assert await async_setup_component(hass, 'script', {})
+
+    # Testing it doesn't raise
+    await hass.services.async_call(
+        DOMAIN, SERVICE_TURN_OFF, {'entity_id': []}, blocking=True
+    )