Fix trailing whitespace

Change-Id: I618cf9fae9cfb6d47487dddfbde6b2ed54f13264
diff --git a/config/config.py b/config/config.py
index 3e77182..0b0b59d 100644
--- a/config/config.py
+++ b/config/config.py
@@ -110,7 +110,7 @@
         self.visualisation = VisualisationConfigClass()
         self.visualisation.port = 3081
         self.visualisation.enabled = False
-        
+
         # No switch-specific defaults to set
         self.switches = {}