Ludovic Courtès fa3d9c4db4
upstream: 'download-tarball' gracefully handles missing signatures.
This avoids a backtrace with "guix refresh -u rdiff-backup", which has
".asc" signatures instead of ".sig".

* guix/upstream.scm (download-tarball): Gracefully handle the case where
SIG is false.
* guix/gnu-maintenance.scm (latest-savannah-release): Add comment about
'file->signature'.
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