sinrev(0, 0) bug

[dpsanders]

julia> sin_rev(0..0, 0..0)
(∅, ∅)

This should give 0..0.

[dpsanders]

This is due to

julia> R = IntervalContractors.reflect_x(IntervalContractors.half_pi)
#1 (generic function with 1 method)

julia> Y = R(X)
[3.14159, 3.1416] × [0, 0]

julia> IntervalContractors.sin_main(Y)
∅ × [0, 0]