bug fixing in plat_av

src/juobs_tools.jl

@@ -186,7 +186,7 @@ function md_sea(a::uwreal, md::Vector{Matrix{Float64}}, ws::ADerrors.wspace=ADer
     end
 end
 
-function plat_av(obs::Vector{uwreal}, plat::Vector{Int64}, wpm::Union{Dict{Int64,Vector{Float64}},Dict{String,Vector{Float64}}, Nothing})
+function plat_av(obs::Vector{uwreal}, plat::Vector{Int64}, wpm::Union{Dict{Int64,Vector{Float64}},Dict{String,Vector{Float64}}, Nothing}=nothing)
     isnothing(wpm) ? uwerr.(obs) : uwerr.(obs, wpm)
     w = 1 ./ err.(obs)[plat[1]:plat[2]].^2
     av = sum(w .* obs[plat[1]:plat[2]]) / sum(w)