Avoid errors from empty variables

- Make sure vairables are initialized as empty maps instead of None
- Fix some style issues

Change-Id: I39d3bea85af25e264ee560f7ceba492adc364887
diff --git a/TestON/tests/FUNC/FUNCnetconf/FUNCnetconf.py b/TestON/tests/FUNC/FUNCnetconf/FUNCnetconf.py
index d5f6e1f..1937b8a 100644
--- a/TestON/tests/FUNC/FUNCnetconf/FUNCnetconf.py
+++ b/TestON/tests/FUNC/FUNCnetconf/FUNCnetconf.py
@@ -113,7 +113,6 @@
                                 onpass="Nodes check successful.",
                                 onfail="Nodes check failed.")
 
-
     def CASE19( self, main ):
         """
             Copy the karaf.log files after each testcase cycle
diff --git a/TestON/tests/USECASE/SegmentRouting/dependencies/Testcaselib.py b/TestON/tests/USECASE/SegmentRouting/dependencies/Testcaselib.py
index 87e1bec..d4a7b7e 100644
--- a/TestON/tests/USECASE/SegmentRouting/dependencies/Testcaselib.py
+++ b/TestON/tests/USECASE/SegmentRouting/dependencies/Testcaselib.py
@@ -1609,7 +1609,6 @@
                 buildOutput += handle.before
                 main.log.debug( buildOutput )
 
-
             confDir = "/tmp/mn_conf/"
             # Try to ensure the destination exists
             main.log.info( "Create folder for network config files" )
diff --git a/TestON/tests/dependencies/ONOSSetup.py b/TestON/tests/dependencies/ONOSSetup.py
index af113f7..fabfe9a 100644
--- a/TestON/tests/dependencies/ONOSSetup.py
+++ b/TestON/tests/dependencies/ONOSSetup.py
@@ -442,7 +442,8 @@
             for ctrl in main.Cluster.active():
                 main.log.debug( "{} components not ACTIVE: \n{}".format(
                     ctrl.name,
-                    ctrl.CLI.sendline( "onos:scr-list | grep -v ACTIVE" ) ) )  #FIXME: This output has changed a lot
+                    #  FIXME: This output has changed a lot
+                    ctrl.CLI.sendline( "onos:scr-list | grep -v ACTIVE" ) ) )
             main.log.error( "Failed to start ONOS, stopping test" )
             main.cleanAndExit( msg="Failed to start ONOS: not all nodes are in READY state" )
         return main.TRUE