Dina Belova b9d97599e4 Use None instead of mutables in method params defaults
Mutables in the method params defaults might cause errors and
that's why it's anti-pattern in most of the cases and should be
removed.

Change-Id: Ifb59a16c927a4bc285f7b70fac87f719054020f4
2014-05-22 15:20:36 +04:00
..
2012-11-30 11:07:30 +01:00