Revert "py3: sortKey() must be a string as comparison between str and...

Revert "py3: sortKey() must be a string as comparison between str and None/int/tuple now raises TypeError."

This reverts commit 192c2000
4 jobs for for_testrunner_2 in 0 seconds
Status Job ID Name Coverage
  External
failed ERP5.CodingStyleTest-TestRunner2

00:45:22

failed ERP5.UnitTest-TestRunner2

03:40:58

failed ERP5.UnitTest-TestRunner2

01:27:53

canceled ERP5.UnitTest-TestRunner2