Use similar in empty

[jishnub]

After this,

julia> S = StructArray{Complex{Int}}(([1,2], [3,4]))
2-element StructArray(::Vector{Int64}, ::Vector{Int64}) with eltype Complex{Int64}:
 1 + 3im
 2 + 4im

julia> empty(S)
0-element StructArray(::Vector{Int64}, ::Vector{Int64}) with eltype Complex{Int64}

instead of

julia> empty(S)
Complex{Int64}[]

This behavior matches the docstring now: "Create an empty vector similar to v". Often, similar will fall back to creating a Vector, so the current behavior will be preserved.

I'm unsure about what test to add for this, so suggestions are welcome. Test added for a StructArray through a new test helper

[Seelengrab]

Perhaps a test with the OffsetArray testhelper or some other non-Vector?

[jishnub]

Gentle bump

[N5N3]

This list is too long to go through.
@nanosoldier runtests()

[nanosoldier]

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