[pitivi] Fix pylint global-*

[Thibault Saunier <tsaunier src gnome org>]

commit 25eddc9a3cd5b1ecbc171918533c0a73c8758079
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Fri Nov 1 07:37:43 2019 +0100

    Fix pylint global-*

 pitivi/utils/loggable.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/pitivi/utils/loggable.py b/pitivi/utils/loggable.py
index 699097a8..535ea081 100644
--- a/pitivi/utils/loggable.py
+++ b/pitivi/utils/loggable.py
@@ -43,6 +43,7 @@ _log_handlers = []
 _log_handlers_limited = []
 
 _initialized = False
+_enable_crack_output = False
 
 _stdout = None
 _stderr = None
@@ -273,7 +274,6 @@ def register_category(category):
     # parse what level it is set to based on _DEBUG
     # example: *:2,admin:4
     global _DEBUG
-    global _levels
     global _categories
 
     level = 0