Env file missing error

[tobinbc]

Currently if you do not have a .env and do not use any env fields in next.config.js the component causes a full JS / rendering error in the browser, because process.env will not be defined at all.

Added a try catch for extracting the id from env or from the props.

Prompted because I am using publicRuntimeConfig instead of env.

Would also help with https://github.com/MauricioRobayo/nextjs-google-analytics/issues/451