Markus Armbruster c2c7065e17 qapi: Reject blank 'if' conditions in addition to empty ones
"'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>
2019-09-24 14:07:23 +02:00
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