Bug#977781: yarnpkg: fails to download modules

[Akshay S Dinesh]

> Since yarnpkg add command did not return an error, the autpkgtest was 
> succeeding even though it did not add any modules to node_modules 
> directory.
> 


I did a bisect (sort of).

Removing cache is not an issue till commit 232ee703 (New upstream version 
1.22.4+debian)

But, it is an issue at commit d40971ee (Refresh patches (remove parts no 
longer needed)

The one commit in between them - New upstream version 1.22.10+~cs18.39.16 ( 
40af4cca ) could be the one which introduced this.

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