Allow empty ranges in DP
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@ -108,9 +108,6 @@ DouglasPeucker::DouglasPeucker()
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void DouglasPeucker::Run(RandomAccessIt begin, RandomAccessIt end, const unsigned zoom_level)
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{
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// check if input data is invalid
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BOOST_ASSERT_MSG(begin != end, "geometry invalid");
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unsigned size = std::distance(begin, end);
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if (size < 2)
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{
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