MCMCChains.get_sections broken in 6.0.4

[sefffal]

In the latest version of MCMCChains, the function MCMCChains.get_sections(chain) is broken.

julia> MCMCChains.get_sections(chain)
ERROR: ArgumentError: index Symbol[] not found
Stacktrace:
  [1] axisindexes
    @ AxisArrays ~/.julia/packages/AxisArrays/CtyI0/src/indexing.jl:329 [inlined]
  [2] axisindexes
    @ AxisArrays ~/.julia/packages/AxisArrays/CtyI0/src/indexing.jl:199 [inlined]
  [3] macro expansion
    @ AxisArrays ~/.julia/packages/AxisArrays/CtyI0/src/indexing.jl:394 [inlined]
  [4] _to_index(::AxisArrays.AxisArray{…}, ::Tuple{…}, ::Colon, ::Vector{…}, ::Colon)
    @ AxisArrays ~/.julia/packages/AxisArrays/CtyI0/src/indexing.jl:349
  [5] to_index
    @ AxisArrays ~/.julia/packages/AxisArrays/CtyI0/src/indexing.jl:347 [inlined]
  [6] getindex(::AxisArrays.AxisArray{Float64, 3, Array{…}, Tuple{…}}, ::Function, ::Vector{Symbol}, ::Function)
    @ AxisArrays ~/.julia/packages/AxisArrays/CtyI0/src/indexing.jl:123
  [7] Chains(chn::Chains{Float64, AxisArrays.AxisArray{…}, Missing, @NamedTuple{…}, @NamedTuple{…}}, sections::Tuple{Symbol})
    @ MCMCChains ~/.julia/packages/MCMCChains/AQENn/src/chains.jl:114
  [8] Chains(chn::Chains{Float64, AxisArrays.AxisArray{…}, Missing, @NamedTuple{…}, @NamedTuple{…}}, sections::Tuple{Symbol})
    @ MCMCChains ~/.julia/packages/MCMCChains/AQENn/src/chains.jl:104 [inlined]
  [9] #48
    @ ./none:0 [inlined]
 [10] iterate(g::Base.Generator, s::Vararg{Any})
    @ Base ./generator.jl:47 [inlined]
 [11] collect_to!(dest::Vector{Chains{…}}, itr::Base.Generator{Tuple{…}, MCMCChains.var"#48#49"{…}}, offs::Int64, st::Int64)
    @ Base ./array.jl:892
 [12] collect_to_with_first!(dest::Vector{…}, v1::Chains{…}, itr::Base.Generator{…}, st::Int64)
    @ Base ./array.jl:870
 [13] collect(itr::Base.Generator{Tuple{Symbol, Symbol}, MCMCChains.var"#48#49"{Chains{…}}})
    @ Base ./array.jl:844
 [14] get_sections
    @ MCMCChains ~/.julia/packages/MCMCChains/AQENn/src/chains.jl:549 [inlined]
 [15] get_sections(chains::Chains{Float64, AxisArrays.AxisArray{…}, Missing, @NamedTuple{…}, @NamedTuple{…}})
    @ MCMCChains ~/.julia/packages/MCMCChains/AQENn/src/chains.jl:549
 [16] top-level scope
    @ REPL[10]:1
Some type information was truncated. Use `show(err)` to see complete types.

[yebai]

The following example works on most recent release:

val = rand(500, 2, 3)
chn = Chains(val, [:a, :b])
MCMCChains.get_sections(chn)