init() error parsing Celestrak file

[fgasdia]

SpaceIndices is failing one of its own tests with the following (partial) error message:

Testing Running tests...
Functions init_space_index_sets and init_space_index_set: Error During Test at C:\dev\SpaceIndices.jl\test\initialization.jl:11
  Got exception outside of a @test
  MethodError: no method matching AbstractFloat(::SubString{String})
  
  Closest candidates are:
    (::Type{T})(::AbstractChar) where T<:Union{AbstractChar, Number}
    (::Type{T})(::Complex) where T<:Real
     @ Base complex.jl:44
    ...
[SW-All.csv](https://github.com/JuliaSpace/SpaceIndices.jl/files/12582114/SW-All.csv)


  Stacktrace:
    [1] float(x::SubString{String})
      @ Base .\float.jl:294
    [2] (::SpaceIndices.var"#13#15"{Matrix{Any}, Int64})(j::Int64)
      @ SpaceIndices .\essentials.jl:0
    [3] iterate
      @ .\generator.jl:47 [inlined]
    [4] collect(itr::Base.Generator{UnitRange{Int64}, SpaceIndices.var"#13#15"{Matrix{Any}, Int64}})
      @ Base .\array.jl:782
    [5] parse_files(#unused#::Type{SpaceIndices.Celestrak}, filepaths::Vector{String})
      @ SpaceIndices C:\dev\SpaceIndices.jl\src\space_index_sets\celestrak.jl:108
    [6] init(; blocklist::Vector{Any})
      @ SpaceIndices C:\dev\SpaceIndices.jl\src\initialize.jl:63
[SW-All.csv](https://github.com/JuliaSpace/SpaceIndices.jl/files/12582088/SW-All.csv)

    [7] init()
      @ SpaceIndices C:\dev\SpaceIndices.jl\src\initialize.jl:51

I've downloaded the current Celestrak csv file from https://celestrak.org/SpaceData/SW-All.csv (attached) and the entry for today (2023-09-11) has no values for Kp. This line is causing the error in parse_files.
SW-All.csv

[ronisbr]

Fixed! Thanks!

I will tag a new version when the tests pass.