bug#35923: Minification of Javascript for r-shiny fails

[Roel Janssen]

Dear guix,

It seems that the r-shiny package is not functioning correctly due to empty 
minified Javascript
files.

This is empty:
$ ls -lh ./site-library/shiny/www/shared/shiny.min.js
-r--r--r-- 6658 root root 0 Jan  1  1970 
./site-library/shiny/www/shared/shiny.min.js

While its unminified equivalent is definitely not empty:
$ ls -lh ./site-library/shiny/www/shared/shiny.js
-r--r--r-- 3 root root 229K Jan  1  1970 
./site-library/shiny/www/shared/shiny.js

Symlinking the unminified files to the minified files solves the problem.  But 
for production use
I'd like to get the minification to work.

Is it a trivial thing to fix for someone more familiar with the 
minify-build-system?

Kind regards,
Roel Janssen