[Bug 150548] Make empty subject replacement text configureable

[Thomas McGuire]

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http://bugs.kde.org/show_bug.cgi?id=150548         
Thomas.McGuire gmx net changed:

           What    |Removed                     |Added
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           Priority|NOR                         |VLO
            Summary|handling of missing subject |Make empty subject
                   |header                      |replacement text
                   |                            |configureable