PEP8 adaptions

dht.py

 else:
     from . import DEBUG
 
+
 class dht_22(background_task):
     RUN_SLEEP_TIME = 4.0
     MIN_REFRESH_RATE = RUN_SLEEP_TIME
                     self.close()
             else:
                 logger.debug("DHT-Communication failed: Gradient to high. Ignoring data %s!", repr(data))
-                
-
 
     def __dht_data_transmission__(self):
         if not DEBUG: