propagate NaN value in median

[aplavin]

Propagate a NaN value from the input array, instead of creating a NaN anew.

Fixes this error, for example:

julia> using Statistics, Unitful

julia> median([NaN*u"m"])
ERROR: DimensionError: m and NaN are not dimensionally compatible.
Stacktrace:
 [1] convert(::Type{Quantity{Float64, 𝐋, Unitful.FreeUnits{(m,), 𝐋, nothing}}}, x::Float64)
   @ Unitful ~/.julia/packages/Unitful/R4J37/src/conversion.jl:106
 [2] median!(v::Vector{Quantity{Float64, 𝐋, Unitful.FreeUnits{(m,), 𝐋, nothing}}})
   @ Statistics ~/.julia/juliaup/julia-1.10.2+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/Statistics/src/Statistics.jl:815
 [3] _median
   @ ~/.julia/juliaup/julia-1.10.2+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/Statistics/src/Statistics.jl:878 [inlined]
 [4] median(v::Vector{Quantity{Float64, 𝐋, Unitful.FreeUnits{(m,), 𝐋, nothing}}})
   @ Statistics ~/.julia/juliaup/julia-1.10.2+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/Statistics/src/Statistics.jl:874
 [5] top-level scope
   @ REPL[3]:1

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.03%. Comparing base (68869af) to head (cc11ea9).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   97.01%   97.03%   +0.02%     
==========================================
  Files           2        2              
  Lines         435      439       +4     
==========================================
+ Hits          422      426       +4     
  Misses         13       13              

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[aplavin]

bump

[aplavin]

another bump

[aplavin]

yet another bump

[aplavin]

added tests: this PR makes NaN handling in median() consistent with others like mean() and sum()

[aplavin]

yet yet another bump

[aplavin]

yet yet yet another bump...