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libtaskmanager: Fix invalid dataChanged() signal emission

Calling dataChanged() with an invalid QModelIndex() triggered an assertion inside QConcatenateTablesProxyModel (my Qt is built with assertions): ASSERT: "from.isValid()" in file $HOME/cheri/qt5/qtbase/src/corelib/itemmodels/qconcatenatetablesproxymodel.cpp, line 623

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