resolve clang warnings

GUI/Model/Project/DataSource.cpp

@@ -20,6 +20,8 @@
 #include "GUI/Model/Job/JobsSet.h"
 #include "GUI/Model/Project/ProjectDocument.h"
 
+DataSource::~DataSource() = default;
+
 QVector<Data1DItem*> DataSource::mainData1DItems() const
 {
     QVector<Data1DItem*> result;