Zero-index bug in recombination operators that use inmap

[zachdj]

The combinatorial crossovers CX and OX2 will throw the following error if called on two individuals with no genes in common:

ERROR: BoundsError: attempt to access n-element Vector{Bool} at index [0]

Minimal reproducing example:

i1, i2 = zeros(Int, 5), ones(Int, 5)
Evolutionary.CX(i1, i2)
Evolutionary.OX2(i1, i2)

I'm no expert, but I think this is caused by the use of inmap without checking if the resulting index is 0

[zachdj]

Possibly related issue, when OX1 is called with the input example, it results in an infinite loop

e.g.

i1, i2 = zeros(Int, 5), ones(Int, 5)
Evolutionary.OX1(i1, i2)  # runs forever