[Merge] ~bdrung/ubuntu/+source/initramfs-tools:ubuntu/devel-drm into ~ubuntu-core-dev/ubuntu/+source/initramfs-tools:ubuntu/devel

[Benjamin Drung]

The "${MODULES-}" is used in case "set -u" is used. See https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html

Thanks for your review. I'll use that syntax for the second occurrence and release that new version.
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https://code.launchpad.net/~bdrung/ubuntu/+source/initramfs-tools/+git/initramfs-tools/+merge/462691
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