Review Request 129713: Only try to open the file if it's not empty

[Aleix Pol Gonzalez]

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https://git.reviewboard.kde.org/r/129713/
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Review request for KDE Frameworks and Jeremy Whiting.


Repository: knewstuff


Description
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The filename will (always?) be empty, this would end up in an error such as `QFSFileEngine::open: No file name specified`.
This patch prevents the code path.


Diffs
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  src/core/security.cpp e9f3ee0 

Diff: https://git.reviewboard.kde.org/r/129713/diff/


Testing
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Thanks,

Aleix Pol Gonzalez

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