`show(var::OutputVar)` errors if `var.dims` is empty

[nefrathenrici]

I recently ran into this error with a fully averaged OutputVar without any dims.
I believe this happens due to this line:
max_length_dims = maximum(length(x) for (x, _) in var.dims)

julia> year_net_radiation
Attributes:
  short_name => rlut + rsut - rsdt
  long_name  => TOA Outgoing Longwave Radiation, average within 1 Month + TOA Outgoing Shortwave Radiation, average within 1 Month - TOA Incident Shortwave Radiation, average within 1 Month averaged over lat (-90.0 to 90.0degrees_north) averaged over lon (-180.0 to 180.0degrees_east) averaged over time (2.592e6 to 3.93984e7s)
Dimension attributes:
Data defined over:
Error showing value of type OutputVar{Vector{Float32}, Array{Float32, 0}, Any, Dict{Union{AbstractString, Symbol}, Any}}:
ERROR: ArgumentError: reducing over an empty collection is not allowed; consider supplying `init` to the reducer
Stacktrace:
  [1] _empty_reduce_error()
    @ Base ./reduce.jl:319
  [2] mapreduce_empty(f::Function, op::Base.BottomRF{typeof(max)}, T::Type)
    @ Base ./reduce.jl:321
  [3] reduce_empty(op::Base.MappingRF{ClimaAnalysis.Var.var"#119#122", Base.BottomRF{typeof(max)}}, ::Type{Pair{String, Vector{Float32}}})
    @ Base ./reduce.jl:358
  [4] reduce_empty_iter
    @ ./reduce.jl:381 [inlined]
  [5] reduce_empty_iter
    @ ./reduce.jl:380 [inlined]
  [6] foldl_impl
    @ ./reduce.jl:49 [inlined]
  [7] mapfoldl_impl
    @ ./reduce.jl:44 [inlined]
  [8] mapfoldl
    @ ./reduce.jl:175 [inlined]
  [9] mapreduce
    @ ./reduce.jl:307 [inlined]
 [10] maximum
    @ ./reduce.jl:761 [inlined]
 [11] show(io::IOContext{Base.TTY}, var::OutputVar{Vector{Float32}, Array{Float32, 0}, Any, Dict{Union{AbstractString, Symbol}, Any}})
    @ ClimaAnalysis.Var ~/.julia/packages/ClimaAnalysis/VYWLo/src/Var.jl:2001
 [12] show(io::IOContext{Base.TTY}, ::MIME{Symbol("text/plain")}, x::OutputVar{Vector{Float32}, Array{Float32, 0}, Any, Dict{Union{AbstractString, Symbol}, Any}})
    @ Base.Multimedia ./multimedia.jl:47
 [13] (::REPL.var"#68#69"{REPL.REPLDisplay{REPL.LineEditREPL}, MIME{Symbol("text/plain")}, Base.RefValue{Any}})(io::Any)
    @ REPL ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:367
 [14] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:661
 [15] display(d::REPL.REPLDisplay, mime::MIME{Symbol("text/plain")}, x::Any)
    @ REPL ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:353
 [16] display
    @ ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:372 [inlined]
 [17] display(x::Any)
    @ Base.Multimedia ./multimedia.jl:340
 [18] #invokelatest#2
    @ ./essentials.jl:1055 [inlined]
 [19] invokelatest
    @ ./essentials.jl:1052 [inlined]
 [20] print_response(errio::IO, response::Any, show_value::Bool, have_color::Bool, specialdisplay::Union{Nothing, AbstractDisplay})
    @ REPL ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:409
 [21] (::REPL.var"#70#71"{REPL.LineEditREPL, Pair{Any, Bool}, Bool, Bool})(io::Any)
    @ REPL ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:378
 [22] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:661
 [23] print_response(repl::REPL.AbstractREPL, response::Any, show_value::Bool, have_color::Bool)
    @ REPL ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:376
 [24] (::REPL.var"#do_respond#96"{Bool, Bool, REPL.var"#112#130"{REPL.LineEditREPL, REPL.REPLHistoryProvider}, REPL.LineEditREPL, REPL.LineEdit.Prompt})(s::REPL.LineEdit.MIState, buf::Any, ok::Bool)
    @ REPL ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:1003
 [25] #invokelatest#2
    @ ./essentials.jl:1055 [inlined]
 [26] invokelatest
    @ ./essentials.jl:1052 [inlined]
 [27] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:2755
 [28] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
    @ REPL ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:1474
 [29] (::REPL.var"#75#81"{REPL.LineEditREPL, REPL.REPLBackendRef})()
    @ REPL ~/.julia/juliaup/julia-1.11.3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:480

julia> year_net_radiation.data
0-dimensional Array{Float32, 0}:
16.61134

julia> year_net_radiation.dims
OrderedCollections.OrderedDict{String, Vector{Float32}}()

[ph-kev]

This should be fixed by PR #206