Continue: Fix for PONSIM exit issue with execption

Change-Id: I28a4de3085b50b28773d01057bddb98ba696e237
diff --git a/ponsim/main.py b/ponsim/main.py
index 3e32d3a..16ddfac 100755
--- a/ponsim/main.py
+++ b/ponsim/main.py
@@ -178,7 +178,7 @@
         self.teardown_networking_assets(self.args.name, self.args.onus)
         if self.grpc_server is not None:
             yield self.grpc_server.stop()
-        
+
     def start_reactor(self):
         from twisted.internet import reactor
         reactor.callWhenRunning(