make sure :transform is tested for transformers

Author: ablaom

src/attemptors.jl

@@ -93,6 +93,9 @@ function operations(fitted_machine, data...; throw=false, verbosity=1)
         model = fitted_machine.model
         operations = String[]
         methods = MLJBase.implemented_methods(fitted_machine.model)
+        if model isa Static && !(:transform in methods)
+            push!(methods, :transform)
+        end 
         _, test = MLJBase.partition(1:MLJBase.nrows(first(data)), 0.5)
         if :predict in methods
             predict(fitted_machine, first(data))