fix: handle cu returning no devices

pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pyswitchbee"
-version = "1.7.24"
+version = "1.7.25"
 description = "SwitchBee Python Integration."
 readme = "README.md"
 authors = [{ name = "Jafar Atili", email = "[email protected]" }]

src/switchbee/api/central_unit.py

@@ -453,6 +453,11 @@ async def fetch_states(
             ]
         )
 
+        if not states:
+            logger.debug('get_multiple_states returned empty dict')
+            return
+
+
         for device_state in states[ApiAttribute.DATA]:
             device_id = device_state[ApiAttribute.ID]