[fix] `set -e`: ensure `nvm_version` returning 3, and `nvm_alias` returning 2, doesn’t terminate the process.
[fix] `set -e`: ensure `nvm_version` returning 3, and `nvm_alias` returning 2, doesn’t terminate the process.

ljharb/nvm,PeterDaveHello/nvm,ljharb/nvm,lukechilds/nvm,edwmurph/nvm,lukechilds/nvm,PeterDaveHello/nvm,creationix/nvm,PeterDaveHelloKitchen/nvm,creationix/nvm,evocateur/nvm,edwmurph/nvm,evocateur/nvm,PeterDaveHelloKitchen/nvm