Make sure os is not even partly destroyed

ddanier · ddanier · commit 85e78ca3d9de · 2016-06-01T18:01:34.000+02:00
diff --git a/git/cmd.py b/git/cmd.py
@@ -287,7 +287,7 @@ def __del__(self):
                 return
 
             # can be that nothing really exists anymore ...
-            if os is None:
+            if os is None or os.kill is None:
                 return
 
             # try to kill it
