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In multiprocessing, if you give a pool.map a zero-length iterator and
specify a nonzero chunksize, the process hangs indefinitely. Example:
import multiprocessing
pool = multiprocessing.Pool()
pool.map(len, [], chunksize=1)
# hang forever
Attached simple testcase and simple fix. I observed this behavior on 2.6
and 3.1, but only verified the patch on 3.1. Unless the line numbers
changed it will probably fix it on 2.6 as well.