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

[Aleix Pol Gonzalez]

apol marked an inline comment as done.
apol added inline comments.

INLINE COMMENTS

> ltoscano wrote in FindDocBookXML4.cmake:88
> Isn't ${found_dir} undefined at this point?

no, this is an argument to the function and it has to contain the output variable, as used in the line 86.

REPOSITORY
  R238 KDocTools

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

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