Serhiy Storchaka added the comment:

This is a duplicate of issue11471.

Explicit check for NULL is not needed because the asdl_seq_LEN() macro checks 
its argument for NULL.

----------
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> If without else generates redundant jump
versions:  -Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4

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<http://bugs.python.org/issue22358>
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