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"'if': 'COND'" generates "#if COND". We reject empty COND because it won't compile. Blank COND won't compile any better, so reject that, too. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190914153506.2151-12-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>