just fixed some typological warnings

city_model_structure/attributes/concordia_energy_sensor.py

@@ -30,7 +30,5 @@ class ConcordiaEnergySensor(Sensor):
   def measures(self):
     self._measures.drop = None
 
-
   def add_period(self, period):
     self._measures.append(period)
-

city_model_structure/attributes/sensor.py

@@ -4,6 +4,7 @@ SPDX - License - Identifier: LGPL - 3.0 - or -later
 Copyright © 2020 Project Author Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
 """
 
+
 class Sensor:
   def __init__(self):
     self._name = None
@@ -39,7 +40,6 @@ class Sensor:
     """
     return self._units
 
-
   @property
   def location(self):
     """
@@ -47,7 +47,6 @@ class Sensor:
     """
     return self._location
 
-
   @location.setter
   def location(self, value):
     """