Clean up the display of errors during middleware instantiation

[edmorley]

Before:

$ webpack --mode production
/app/node_modules/webpack-cli/bin/cli.js:244
                                throw err;
                                ^

Error: Using "env" in middleware has been removed. Apply middleware conditionally instead.
    at Neutrino.use (/app/node_modules/neutrino/Neutrino.js:220:15)
    at module.exports (/app/node_modules/neutrino/index.js:35:14)
    at module.exports (/app/webpack.config.js:9:10)
    ...

After:

$ webpack --mode production

An error occurred when loading the Neutrino configuration.

Error: Using "env" in middleware has been removed. Apply middleware conditionally instead.
    at Neutrino.use (/app/node_modules/neutrino/Neutrino.js:220:15)
    at module.exports (/app/node_modules/neutrino/index.js:36:16)
    at module.exports (/app/webpack.config.js:9:10)
    ...

[eliperelman]

Very nice!