`map!(f,dest::ChainedVector,src::AbstractArray)` doesn't work for shorter `src`

[laborg]

In case the src array is shorter an error is thrown:

julia> map!(i->-i,ChainedVector([[1,2,3]]),[10:11...])
ERROR: MethodError: no method matching getindex(::Nothing, ::Int64)
The function `getindex` exists, but no method is defined for this combination of argument types.
Stacktrace:
 [1] map!(f::var"#1#2", x::ChainedVector{Int64, Vector{Int64}}, A::Vector{Int64})
   @ SentinelArrays ~/.julia/packages/SentinelArrays/vt8A6/src/chainedvector.jl:781
 [2] top-level scope
   @ REPL[8]:1

This is due to the fact that the implementation iterates the destination array instead of the src array.