--- a/runtime/NevowServer.py	Tue Aug 15 12:17:51 2017 +0300
+++ b/runtime/NevowServer.py	Tue Aug 15 15:50:30 2017 +0300
@@ -89,7 +89,7 @@
 
     def HMIexec(self, function, *args, **kwargs):
         if self.HMI is not None:
-            getattr(self.HMI, function, lambda:None)(*args, **kwargs)
+            getattr(self.HMI, function, lambda: None)(*args, **kwargs)
     athena.expose(HMIexec)
 
     def resetHMI(self):