Fix WAQI being zero (#97767)

homeassistant/components/waqi/sensor.py

@@ -142,7 +142,7 @@ class WaqiSensor(SensorEntity):
     @property
     def native_value(self):
         """Return the state of the device."""
-        if value := self._data.get("aqi"):
+        if (value := self._data.get("aqi")) is not None:
             with suppress(ValueError):
                 return float(value)
         return None