D19224: Only report DocBookXML as found if it was actually found

[Aleix Pol Gonzalez]

apol created this revision.
apol added a reviewer: Frameworks.
Herald added projects: Frameworks, Documentation.
Herald added subscribers: kde-doc-english, kde-frameworks-devel.
apol requested review of this revision.

REVISION SUMMARY
  Otherwise we generate files with paths such as "searched_dir-NOTFOUND/docbookx.dtd"

REPOSITORY
  R238 KDocTools

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D19224

AFFECTED FILES
  cmake/FindDocBookXML4.cmake

To: apol, #frameworks
Cc: kde-frameworks-devel, kde-doc-english, gennad, michaelh, ngraham, bruns, skadinna
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