Ignore empty extra lines in train.txt

AlexeyAB

2018-05-29 ec766fc3f114dd4faaa3add500776a7bae957ba5

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classes= 20
train  = /home/pjreddie/data/voc/train.txt
valid  = /home/pjreddie/data/voc/2007_test.txt
names = data/voc.names
backup = /home/pjreddie/backup/