Ludovic Courtès fbdb7b9526
pack: Fix "-C none -f tarball".
Fixes a regression introduced in
48b444304e206c35cf2c8e0d87a4711f1aac4fd4 whereby "guix pack -C none
hello" would fail with:

  ERROR: In procedure string-join:
  In procedure string-join: Wrong type argument in position 1: #f
  builder for `/gnu/store/…-tarball-pack.tar.drv' failed with exit code 1

* guix/scripts/pack.scm (self-contained-tarball): Adjust for when
'compressor-command' returns #f.
2018-10-19 18:28:57 +02:00
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