Two more cases of switch(PySequence_Size()) without checking for case -1. (Same problem as last checkin for SF bug 610610) Need to clear the error and proceed.
Two more cases of switch(PySequence_Size()) without checking for case -1.
(Same problem as last checkin for SF bug 610610)
Need to clear the error and proceed.

Backport candidate

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator