safe_mapslices at test/reducedim.jl is broken on 0.7

[rofinn]

This is what was causing the error on master in #280.

Code to reproduce:

julia> srand(1234)

julia> Areduc = DataArray(rand(3, 4, 5, 6), rand(3, 4, 5, 6) .< 0.2)

julia> region = 5

julia> outputs = Any[DataArray(fill(NaN, length.(Base.reduced_indices(indices(Areduc), region))))]

julia> function safe_mapslices{T}(f::Function, A::AbstractArray{T}, region, skipna)
# Copied from https://github.com/JuliaStats/DataArrays.jl/blob/master/test/reducedim.jl#L41
# ...

julia> safe_mapslices(mean, Areduc, region, true)
# 0.6
3×4×5×6 DataArrays.DataArray{Float64,4}:
3×4×5×6 DataArrays.DataArray{Float64,4}:
[:, :, 1, 1] =
   0.590845    0.460085  NaN         NaN
 NaN         NaN           0.298614    0.648882
   0.566237  NaN           0.246837  NaN

[:, :, 2, 1] =
 0.066423  0.112486  NaN           0.96467
 0.956753  0.276021    0.842714    0.945775
 0.646691  0.651664    0.950498  NaN

[:, :, 3, 1] =
 0.82116      0.314926  NaN         0.0118196
 0.0341601  NaN           0.438939  0.0460428
 0.0945445    0.374187  NaN         0.496169

...

# 0.7 
3×4×5×6 DataArrays.DataArray{Float64,4}:
3×4×5×6 DataArrays.DataArray{Float64,4}:
[:, :, 1, 1] =
 0.590845  0.460085  0.0       0.0
 0.0       0.0       0.298614  0.648882
 0.566237  0.0       0.246837  0.0

[:, :, 2, 1] =
 0.066423  0.112486  0.0       0.96467
 0.956753  0.276021  0.842714  0.945775
 0.646691  0.651664  0.950498  0.0

[:, :, 3, 1] =
 0.82116    0.314926  0.0       0.0118196
 0.0341601  0.0       0.438939  0.0460428
 0.0945445  0.374187  0.0       0.496169

...

[andreasnoack]

Should be fixed by JuliaLang/julia#23385

[andreasnoack]

We should restart the tests and confirm that this is fixed when master is not broken anymore.