should to treated specially when first insert a tail node

[johnzhaoxiao]

Python/data_structures/linked_list/doubly_linked_list.py

Line 36 in 20b21e5

def insertTail(self, x):

[zky001]

Python/data_structures/linked_list/doubly_linked_list.py

Line 36 in 20b21e5

def insertTail(self, x):

I think it's not necessary to treated specially when first insert a tail node.

[cclauss]

#2052 says that we need tests before we need other modifications.

[stale]

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[stale]

Please reopen this issue once you commit the changes requested or make improvements on the code. Thank you for your contributions.