io:load throws error when loading ~spl(a,5) formula without using BSPlineKit "don't know how to generate modelcols"

[behinger]

when load an unfoldmodel that contains a formula 0~spl(a,5), JLD2 throws a more-or-less cryptic error, in cases using BSPlineKit was not called

ERROR: ArgumentError: don't know how to generate modelcols for term [email protected]{Tuple}(((is_face, Reconstruct@BSplineTerm{StatsModels.ContinuousTerm{Float64},Int64}(Any[sac_amplitude, 4, 4, [0.42, 24.26]]), Reconstruct@BSplineTerm{StatsModels.ContinuousTerm{Float64},Int64}(Any[fix_avgpos_x, 4, 4, [167.8, 3613.3]]), Reconstruct@BSplineTerm{StatsModels.ContinuousTerm{Float64},Int64}(Any[fix_avgpos_y, 4, 4, [171.5, 1975.8]])),)). Did you forget to call apply_schema?

idea from @jschepers: check while loading if a formula has a spline and check if BSplineKit is loaded or not