Explicitly check if the event loop is running in the while loop condition

Signed-off-by: Mathias L. Baumann <[email protected]>

Author: Marenz

src/frequenz/sdk/microgrid/_power_distributing/_component_status/_battery_status_tracker.py

@@ -262,7 +262,9 @@ async def _run(
         inverter = inverter_receiver
         set_power_result = set_power_result_receiver
 
-        while True:
+        # To prevent entering a shutdown-loop, we explicitly check if there is
+        # an eventloop running
+        while asyncio.get_event_loop().is_running():
             try:
                 async for selected in select(
                     battery,