remove unnecessary iteration if b.chunks is not set
remove unnecessary iteration if b.chunks is not set

EliteScientist/webpack,g0ddish/webpack,rlugojr/webpack,webpack/webpack,jescalan/webpack,ts-webpack/webpack,g0ddish/webpack,jescalan/webpack,ts-webpack/webpack,rlugojr/webpack,SimenB/webpack,SimenB/webpack,webpack/webpack,EliteScientist/webpack,NekR/webpack,SimenB/webpack,ts-webpack/webpack,jescalan/webpack,webpack/webpack,rlugojr/webpack,g0ddish/webpack,SimenB/webpack,ts-webpack/webpack,webpack/webpack,NekR/webpack