Remove redundant check in async StiebelEltronAPI

Author: ThyMYthOS

pystiebeleltron/__init__.py

@@ -187,8 +187,6 @@ async def connect(self) -> None:
     @property
     def is_connected(self) -> bool:
         """Check modbus client connection status."""
-        if self._client is None:
-            return False
         return self._client.connected
 
     @property