ng-packagr deleted all files from disc

[ozknemoy]

Type of Issue

[x] Bug Report

Description

if set 'dest' to '/' inside ng-package.json the library will delete all files from current disc

How To Reproduce

set 'dest' to '/' inside ng-package.json

Expected Behaviour

throw validation error for example

Version Information

$ node_modules/.bin/ng-packagr --version
ng-packagr:            4.7.1
@angular/compiler:     7.2.16
rollup:                0.67.4
tsickle:               0.36.0
typescript:            3.2.4 
rxjs: 6.3.3
node: v12.22.9
npm: 6.14.15

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