build: Fix helpful output for emacs-build-system install phase.
Detecting when no files were installed was broken when switching to use cond. Test with (not (null? ...)) to fix this. * guix/build/emacs-build-system.scm (install): Fix detecting when no files were installed.
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@ -131,7 +131,7 @@ store in '.el' files."
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(target-directory (string-append out %install-suffix "/" elpa-name-ver))
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(files-to-install (find-files source install-file?)))
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(cond
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(files-to-install
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((not (null? files-to-install))
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(for-each
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(lambda (file)
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(let* ((stripped-file (string-drop file (string-length source)))
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