yarn doesn't remove packages in non-empty namespace

[marzelin]

Bug

What is the current behavior?
When removing package that is installed with a namespace while there is at least one other package in that namespace, package directory won't be removed

If the current behavior is a bug, please provide the steps to reproduce.

yarn add @types/chai
yarn add @types/lodash
yarn remove @types/chai
ls node_modules/@types \\ output: chai/  lodash/

What is the expected behavior?
package directory should be removed from namespace folder:
ls node_modules/@types \\ output: lodash/

node.js, yarn and operating system version.
yarn version: v0.17.8 (as global package)
os: ubuntu 16.10 64-bit
node: v7.1.0

[FDiskas]

Same problem then the files is not removed from node_modules directory on Failed install

[DenisGorbachev]

Fixed in #2036