Handle smarttub sensor values being None (#103385)

* [smarttub] handle sensor values being None

* empty commit to rerun CI

* lint

* use const in test

* reorder checks

* use None instead of STATE_UNKNOWN

* empty commit to rerun CI

* check for STATE_UNKNOWN in test

* empty commit to rerun CI

tests/components/smarttub/test_sensor.py

@@ -2,6 +2,7 @@
 import pytest
 import smarttub
 
+from homeassistant.const import STATE_UNKNOWN
 from homeassistant.core import HomeAssistant
 
 
@@ -27,6 +28,27 @@ async def test_sensor(
     assert state.state == expected_state
 
 
+# https://github.com/home-assistant/core/issues/102339
+async def test_null_blowoutcycle(
+    spa,
+    spa_state,
+    config_entry,
+    hass: HomeAssistant,
+) -> None:
+    """Test blowoutCycle having null value."""
+
+    spa_state.blowout_cycle = None
+
+    config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    entity_id = f"sensor.{spa.brand}_{spa.model}_blowout_cycle"
+    state = hass.states.get(entity_id)
+    assert state is not None
+    assert state.state == STATE_UNKNOWN
+
+
 async def test_primary_filtration(
     spa, spa_state, setup_entry, hass: HomeAssistant
 ) -> None: