fix: do not fail if no process

[alexander-fenster]

The problem was introduced in #1363.

$ npm run make
...
ReferenceError: process is not defined
    at Object.r.39.1 (evalmachine.<anonymous>:7:64076)
    at t (evalmachine.<anonymous>:7:73046)
    at Object.r.42.39 (evalmachine.<anonymous>:7:69283)
    at t (evalmachine.<anonymous>:7:73046)
    at Object.r.18.27 (evalmachine.<anonymous>:7:23855)
    at t (evalmachine.<anonymous>:7:73046)
    at Object.r.17.12 (evalmachine.<anonymous>:7:23036)
    at t (evalmachine.<anonymous>:7:73046)
    at Object.r.19.11 (evalmachine.<anonymous>:7:24055)
    at t (evalmachine.<anonymous>:7:73046)

Let's make sure we actually have process before accessing it.