Minor fix: warning-message if in labels class_id >= classes in cfg-file

AlexeyAB

2018-05-22 768b190b10e61932d78547e44aa9475ae950e409

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aeroplane
bicycle
bird
boat
bottle
bus
car
cat
chair
cow
diningtable
dog
horse
motorbike
person
pottedplant
sheep
sofa
train
tvmonitor