DTclassifier Use decision trees functionality is broken

[simgislab]

Steps:

1. Get test data
2. Add after,tif, presence-poly.shp, absence-poly.shp
3. Run

DTClassifier crashes, QGIS crashes.

Random forest works well on exactly the same data.

[BishopGIS]

Stacktrace of crash

0   org.opencv                    	0x0000000124eb8b55 cv::ml::DTreesImpl::calcValue(int, std::__1::vector<int, std::__1::allocator<int> > const&) + 1397
1   org.opencv                    	0x0000000124eb7b18 cv::ml::DTreesImpl::addNodeAndTrySplit(int, std::__1::vector<int, std::__1::allocator<int> > const&) + 1032
2   org.opencv                    	0x0000000124eb6bf3 cv::ml::DTreesImpl::addTree(std::__1::vector<int, std::__1::allocator<int> > const&) + 579
3   org.opencv                    	0x0000000124eb6945 cv::ml::DTreesImpl::train(cv::Ptr<cv::ml::TrainData> const&, int) + 53
4   org.opencv                    	0x0000000124e65f74 cv::ml::StatModel::train(cv::_InputArray const&, int, cv::_InputArray const&) + 132
5   libdtclassifierplugin.so      	0x00000001248e18ad PrepareModel::doWork() + 2269

Potential problem place:

https://github.com/nextgis/nextgisqgis/blob/master/src/plugins/dtclassifier/classifierworker.cpp#L1040-L1046

Docs:
https://docs.opencv.org/3.1.0/d8/d89/classcv_1_1ml_1_1DTrees.html

[BishopGIS]

Temporary disable at 21f9a80