## Bug
Fixes a TypeError when accessing url with no path params `_next/data/<BUILD_ID>`
```
TypeError: Cannot read property 'endsWith' of undefined
at Object.fn (/app/node_modules/next/server/next-server.ts:644:52)
at Router.execute (/app/node_modules/next/server/router.ts:346:40)
at Server.run (/app/node_modules/next/server/next-server.ts:1229:41)
at Server.handleRequest (/app/node_modules/next/server/next-server.ts:489:25)
at /app/node_modules/next/server/next.ts:47:14
```
- [ ] Related issues linked using `fixes #number`
- [x] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`
- [ ]
## Feature
- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`
## Documentation / Examples
- [x] Make sure the linting passes
