why !isnothing(basisfunction) here?

[behinger]

I dont get why one checks for !isnothing(basisfunction) => a basisfunction exists, but at the same time type <: UnfoldLinearMixedModel
=> this case shouldnt even exist - a UnfoldLinearMixedModel never has a basisfunction, and a UnfoldLinearMixedModelContinuousTime always has one. So whcih is it?

Unfold.jl/src/designmatrix.jl

Line 232 in 61e6d4e

if (!isnothing(basisfunction)) & (type <: UnfoldLinearMixedModel)

[behinger]

a) the following line of code is never reached and can be removed
b) UnfoldLinearMixedModelContinuousTime doesnt currently work (but there are tests)