findall is not working with an empty vector of bool

[amontoison]

ERROR: LoadError: BoundsError: attempt to access 0-element CuArray{Int64, 1, CUDA.DeviceMemory} at index [0]
Stacktrace:
  [1] throw_boundserror(A::CuArray{Int64, 1, CUDA.DeviceMemory}, I::Tuple{Int64})
    @ Base ./abstractarray.jl:737
  [2] checkbounds
    @ ./abstractarray.jl:702 [inlined]
  [3] getindex
    @ ~/.julia/packages/GPUArrays/qt4ax/src/host/indexing.jl:49 [inlined]
  [4] macro expansion
    @ ~/.julia/packages/GPUArraysCore/GMsgk/src/GPUArraysCore.jl:210 [inlined]
  [5] findall(bools::SubArray{Bool, 1, CuArray{Bool, 1, CUDA.DeviceMemory}, Tuple{CuArray{…}}, false})
    @ CUDA ~/git/CUDA.jl/src/indexing.jl:30

The culprit is this line:

CUDA.jl/src/indexing.jl

Line 30 in e359c04

n = @allowscalar indices[end]

We can easily fix it with:

n = isempty(indices) ? 0 : @allowscalar indices[end]