access DimArray at `missing` column value
is there a workaround to access the `missing` value of a named column ?
```julia
da = rand(DD.X([:a, :b, missing]), DD.Y(100.0:50:200.0))
da[X=At(:a)]
da[X=At(missing)]
TypeError: non-boolean (Missing) used in boolean context
Stacktrace:
[1] findnext
@ ./array.jl:2393 [inlined]
[2] findfirst
@ ./array.jl:2444 [inlined]
[3] at(::DimensionalData.Dimensions.Lookups.Unordered, ::DimensionalData.Dimensions.Lookups.NoSpan, lookup::DimensionalData.Dimensions.Lookups.Categorical{Union{Missing, Symbol}, Vector{Union{Missing, Symbol}}, DimensionalData.Dimensions.Lookups.Unordered, DimensionalData.Dimensions.Lookups.NoMetadata}, selval::Missing, atol::Nothing, rtol::Nothing; err::DimensionalData.Dimensions.Lookups._True)
@ DimensionalData.Dimensions.Lookups ~/.julia/packages/DimensionalData/FWnw9/src/Lookups/selector.jl:214
[4] at(::DimensionalData.Dimensions.Lookups.Unordered, ::DimensionalData.Dimensions.Lookups.NoSpan, lookup::DimensionalData.Dimensions.Lookups.Categorical{Union{Missing, Symbol}, Vector{Union{Missing, Symbol}}, DimensionalData.Dimensions.Lookups.Unordered, DimensionalData.Dimensions.Lookups.NoMetadata}, selval::Missing, atol::Nothing, rtol::Nothing)
@ DimensionalData.Dimensions.Lookups ~/.julia/packages/DimensionalData/FWnw9/src/Lookups/selector.jl:213
[5] at(lookup::DimensionalData.Dimensions.Lookups.Categorical{Union{Missing, Symbol}, Vector{Union{Missing, Symbol}}, DimensionalData.Dimensions.Lookups.Unordered, DimensionalData.Dimensions.Lookups.NoMetadata}, sel::DimensionalData.Dimensions.Lookups.At{Missing, Nothing, Nothing}; kw::@Kwargs{})
@ DimensionalData.Dimensions.Lookups ~/.julia/packages/DimensionalData/FWnw9/src/Lookups/selector.jl:158
[6] at(lookup::DimensionalData.Dimensions.Lookups.Categorical{Union{Missing, Symbol}, Vector{Union{Missing, Symbol}}, DimensionalData.Dimensions.Lookups.Unordered, DimensionalData.Dimensions.Lookups.NoMetadata}, sel::DimensionalData.Dimensions.Lookups.At{Missing, Nothing, Nothing})
@ DimensionalData.Dimensions.Lookups ~/.julia/packages/DimensionalData/FWnw9/src/Lookups/selector.jl:157
[7] _selectindices
@ ~/.julia/packages/DimensionalData/FWnw9/src/Lookups/selector.jl:1099 [inlined]
[8] selectindices(l::DimensionalData.Dimensions.Lookups.Categorical{Union{Missing, Symbol}, Vector{Union{Missing, Symbol}}, DimensionalData.Dimensions.Lookups.Unordered, DimensionalData.Dimensions.Lookups.NoMetadata}, sel::DimensionalData.Dimensions.Lookups.At{Missing, Nothing, Nothing}; kw::@Kwargs{})
@ DimensionalData.Dimensions.Lookups ~/.julia/packages/DimensionalData/FWnw9/src/Lookups/selector.jl:1075
[9] _dims2indices
@ ~/.julia/packages/DimensionalData/FWnw9/src/Dimensions/indexing.jl:144 [inlined]
[10] _dims2indices
@ ~/.julia/packages/DimensionalData/FWnw9/src/Dimensions/indexing.jl:136 [inlined]
[11] dims2indices
@ ~/.julia/packages/DimensionalData/FWnw9/src/Dimensions/indexing.jl:31 [inlined]
[12] macro expansion
@ ~/.julia/packages/DimensionalData/FWnw9/src/Dimensions/indexing.jl:89 [inlined]
[13] split_alignments(fa::typeof(DimensionalData.Dimensions.dims2indices), fu::typeof(DimensionalData.Dimensions.unalligned_dims2indices), lookups::Tuple{DimensionalData.Dimensions.Lookups.Categorical{Union{Missing, Symbol}, Vector{Union{Missing, Symbol}}, DimensionalData.Dimensions.Lookups.Unordered, DimensionalData.Dimensions.Lookups.NoMetadata}, DimensionalData.Dimensions.Lookups.Sampled{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.Lookups.ForwardOrdered, DimensionalData.Dimensions.Lookups.Regular{Float64}, DimensionalData.Dimensions.Lookups.Points, DimensionalData.Dimensions.Lookups.NoMetadata}}, dims::Tuple{DimensionalData.Dimensions.X{DimensionalData.Dimensions.Lookups.Categorical{Union{Missing, Symbol}, Vector{Union{Missing, Symbol}}, DimensionalData.Dimensions.Lookups.Unordered, DimensionalData.Dimensions.Lookups.NoMetadata}}, DimensionalData.Dimensions.Y{DimensionalData.Dimensions.Lookups.Sampled{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.Lookups.ForwardOrdered, DimensionalData.Dimensions.Lookups.Regular{Float64}, DimensionalData.Dimensions.Lookups.Points, DimensionalData.Dimensions.Lookups.NoMetadata}}}, I::Tuple{DimensionalData.Dimensions.X{DimensionalData.Dimensions.Lookups.At{Missing, Nothing, Nothing}}, Nothing})
@ DimensionalData.Dimensions ~/.julia/packages/DimensionalData/FWnw9/src/Dimensions/indexing.jl:89
[14] split_alignments(fa::Function, fu::Function, dims::Tuple{DimensionalData.Dimensions.X{DimensionalData.Dimensions.Lookups.Categorical{Union{Missing, Symbol}, Vector{Union{Missing, Symbol}}, DimensionalData.Dimensions.Lookups.Unordered, DimensionalData.Dimensions.Lookups.NoMetadata}}, DimensionalData.Dimensions.Y{DimensionalData.Dimensions.Lookups.Sampled{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.Lookups.ForwardOrdered, DimensionalData.Dimensions.Lookups.Regular{Float64}, DimensionalData.Dimensions.Lookups.Points, DimensionalData.Dimensions.Lookups.NoMetadata}}}, I::Tuple{DimensionalData.Dimensions.X{DimensionalData.Dimensions.Lookups.At{Missing, Nothing, Nothing}}, Nothing})
@ DimensionalData.Dimensions ~/.julia/packages/DimensionalData/FWnw9/src/Dimensions/indexing.jl:87
[15] dims2indices
@ ~/.julia/packages/DimensionalData/FWnw9/src/Dimensions/indexing.jl:56 [inlined]
[16] dims2indices
@ ~/.julia/packages/DimensionalData/FWnw9/src/Dimensions/indexing.jl:32 [inlined]
[17] _dim_getindex
@ ~/.julia/packages/DimensionalData/FWnw9/src/array/indexing.jl:106 [inlined]
[18] getindex
@ ~/.julia/packages/DimensionalData/FWnw9/src/array/indexing.jl:75 [inlined]
[19] macro expansion
@ ~/IKR/Workspace/DissStudy/studies/FinalizingParams/metana.jl#==#f0329cea-10c2-402c-9f5a-3caf2f1ebacf:1 [inlined]
```
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