Fix NLopt crash with gradient-based algorithms when no AD backend specified#1068

ChrisRackauckas merged 1 commit intoSciML:masterSciML/Optimization.jl:masterfrom

ChrisRackauckas-Claude:fix-nlopt-nothing-gradientChrisRackauckas-Claude/Optimization.jl:fix-nlopt-nothing-gradientCopy head branch name to clipboard