iterate with list comprehension instead of filte

Author: edoput

netjsonconfig/backends/airos/airos.py

@@ -55,7 +55,7 @@ class AirOS(BaseBackend):
     def to_intermediate(self):
         super(AirOS, self).to_intermediate()
         for k, v in self.intermediate_data.items():
-            self.intermediate_data[k] = filter(lambda x: x != {}, flatten(intermediate_to_list(v)))
+            self.intermediate_data[k] = [ x for x in flatten(intermediate_to_list(v)) if x != {}]
 
 def flatten(xs):
     """