Error handling when trying to nondimensionalize unitless numbers

[albert-de-montserrat]

Adresses #197. Trying to non-dimensionalize non-GeoUnits types results into an error, instead of hanging forever.

julia>     @test_throws ArgumentError nondimensionalize(5, CharUnits_GEO)       
Test Passed
      Thrown: ArgumentError

julia>     @test_throws ArgumentError nondimensionalize(5e0, CharUnits_GEO)     
Test Passed
      Thrown: ArgumentError
julia>     @test_throws ArgumentError nondimensionalize([10 1; 20 30.0], CharUnits_GEO)
Test Passed
      Thrown: ArgumentError

julia>     @test_throws ArgumentError nondimensionalize((10, 1), CharUnits_GEO) 
Test Passed
      Thrown: ArgumentError
julia>     @test_throws ArgumentError nondimensionalize((10e0, 1e0), CharUnits_GEO)
Test Passed
      Thrown: ArgumentError

[albert-de-montserrat]

CC @ArneSpang

[albert-de-montserrat]

Not it also handles empty arrays

julia> nondimensionalize([], CharDim)
ERROR: ArgumentError: The input parameter should have units
Stacktrace:
 [1] nondimensionalize(::Vector{Any}, ::GeoUnits{GEO})
   @ GeoParams.Units c:\Users\albert\Desktop\DevPkgs\GeoParams.jl\src\Units.jl:605
 [2] top-level scope
   @ REPL[8]:1

julia> nondimensionalize(Float64[], CharDim)
ERROR: ArgumentError: The input parameter should have units      
Stacktrace:
 [1] nondimensionalize(::Vector{Float64}, ::GeoUnits{GEO})       
   @ GeoParams.Units c:\Users\albert\Desktop\DevPkgs\GeoParams.jl\src\Units.jl:605
 [2] top-level scope
   @ REPL[9]:1   

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[albert-de-montserrat]

closes #197