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由 Markus Armbruster 提交于
qobject_to_qstring() crashes on null, which is a trap for the unwary. Return null instead, and simplify a few callers. Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Message-Id: <1444918537-18107-7-git-send-email-armbru@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NLuiz Capitulino <lcapitulino@redhat.com>
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