Option validation not showing errors

[filipesilva]

🐞 Bug report

Command (mark with an x)

- [ ] new
- [x] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Is this a regression?

Yes, the previous version in which this bug was not present was: 7.x

Description

When using unknown options in angular.json, errors are not shown correctly.

🔬 Minimal Reproduction

npm install -g @angular/cli@8.0.0-beta.18
ng new validation-proj
cd validation-proj
# edit `angular.json` and change `outputPath` to `notOutputPath`
ng build

🔥 Exception or Error

D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\util\hostReportError.js:4
    setTimeout(function () { throw err; });
                             ^

Error: Options did not validate.[object Object]
    at MapSubscriber.registry.compile.pipe.operators_1.map.result [as project] (D:\sandbox\es2015-forwardref\node_modules\@angular-devkit\architect\src\architect.js:39:31)
    at MapSubscriber._next (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\operators\map.js:49:35)
    at MapSubscriber.Subscriber.next (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\Subscriber.js:66:18)
    at MergeMapSubscriber.notifyNext (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\operators\mergeMap.js:92:26)
    at InnerSubscriber._next (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\InnerSubscriber.js:28:21)
    at InnerSubscriber.Subscriber.next (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\Subscriber.js:66:18)
    at MapSubscriber._next (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\operators\map.js:55:26)
    at MapSubscriber.Subscriber.next (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\Subscriber.js:66:18)
    at SwitchMapSubscriber.notifyNext (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\operators\switchMap.js:86:26)
    at InnerSubscriber._next (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\InnerSubscriber.js:28:21)
    at InnerSubscriber.Subscriber.next (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\Subscriber.js:66:18)
    at D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\util\subscribeTo.js:17:28
    at Object.subscribeToResult (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\util\subscribeToResult.js:10:45)
    at SwitchMapSubscriber._innerSub (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\operators\switchMap.js:65:54)
    at SwitchMapSubscriber._next (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\operators\switchMap.js:55:14)
    at SwitchMapSubscriber.Subscriber.next (D:\sandbox\es2015-forwardref\node_modules\rxjs\internal\Subscriber.js:66:18)

🌍 Your Environment

Anything else relevant?
This error reporting seems to come from

angular-cli/packages/angular_devkit/architect/src/architect.ts

Line 286 in 0f9de92

'Data did not validate: ' + (errors ? errors.join() : 'Unknown error.'),

cc @istiti

[filipesilva]

#14274 fixed the error message. It still shows a stack trace though, and shouldn't.