getStats fails if the BRT wasn't made with gbm.step #6
Description
If runBRT was run with model='perf' or model='gbm', getStats fails as the submodels for each fold of the optimal model are not kept.
Maybe this can be fixed by running a single gbm.step starting and ending on n.trees (for method='gbm') or the result of gbm.perf (for method = 'perf')?