D8007: popplerextractor: don't try to guess the title if there isn't one.

[Nathaniel Graham]

ngraham added reviewers: Frameworks, Okular.

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D8007

To: flameeyes, #frameworks, #okular
Cc: #frameworks
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