bugfix: add behaviour on empty build and shared data

ServerLMS/Systems/updatecontroller.h

@@ -9,6 +9,8 @@
 #include <QDebug>
 #include <QDataStream>
 #include <QMutex>
+#include <QApplication>
+#include <QMessageBox>
 
 #include <Systems/Parsers/dataparser.h>
 #include <Data/typesDataServerClient.h>
@@ -66,6 +68,7 @@ public slots:
 
 signals:
     void sigLogMessage(QString message);
+    void sigErrorRequired(int code);
 
 private:
     QList<FileData> clientDataList;
@@ -94,6 +97,7 @@ private:
     void saveHash(QString fileName,QList<FileData> *fileList);
     void loadHash();
     void CalculateSizeToSend(QList<FileData> diffList);
+    bool checkRequiredFolder();
 };
 
 #endif // UPDATECONTROLLER_H