fixed SIFT when keypoints vector is empty (#1162)
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@ -1722,6 +1722,7 @@ void SIFT::operator()(const Mat& image, const Mat& mask,
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KeyPointsFilter::removeDuplicated( keypoints );
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// Compute descriptors.
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if( featuresSeq->total > 0 )
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cvSeqRemoveSlice( featuresSeq, cvSlice(0, featuresSeq->total) );
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}
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