The json schema was incorrectly warning because `port: ''` is valid and we document and use it in examples. The empty string is different than undefined
- empty string: match only URLs without a port
- undefined: match URLs with any port
I noticed this when running one of our examples:
```
pnpm next dev examples/image-component
ready - started server on 0.0.0.0:3000, url: http://localhost:3000
warn - Invalid next.config.js options detected:
- The value at .images.remotePatterns[0].port must be 1 character or more but it was 0 characters.
See more info here: https://nextjs.org/docs/messages/invalid-next-config
```
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