Add remind user to execute empty scan.

src/forms/settings/SystemCorrectionForm.h

@@ -3,6 +3,8 @@
 
 #include <QWidget>
 
+class QLabel;
+
 class SystemCorrectionForm : public QWidget
 {
     Q_OBJECT
@@ -13,6 +15,13 @@ public:
 
 private:
     void init();
+
+private slots:
+    void updateEmptyScanDate();
+
+private:
+    QLabel* mCurrentEmptyScanDate;
+    QLabel* mExpirationEmptyScanDate;
 };
 
 #endif // SYSTEMCORRECTIONFORM_H