check MassChroQ parameters

src/gui/export/export_masschroq_dialog/export_masschroq_dialog.ui

@@ -11,7 +11,7 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Form</string>
+   <string>MassChroQ parameters</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_2">
    <item>

src/gui/export/export_masschroq_dialog/exportmasschroqdialog.cpp

@@ -34,6 +34,7 @@
 #include "exportmasschroqdialog.h"
 #include <QDebug>
 #include <QSettings>
+#include <QMessageBox>
 
 ExportMasschroqDialog::ExportMasschroqDialog(QWidget *parent)
   : QDialog(parent), ui(new Ui::ExportMasschroqDialog)
@@ -101,3 +102,35 @@ ExportMasschroqDialog::getMasschroqFileParameters() const
     }
   return params;
 }
+
+
+void
+ExportMasschroqDialog::accept()
+{
+  QString error_message;
+  if(ui->outputFileEdit->text().isEmpty())
+    {
+      error_message = QString(tr("MassChroqML result file name must be set"));
+    }
+  if(ui->comparFileGroupBox->isChecked())
+    {
+      if(ui->comparFileEdit->text().isEmpty())
+        {
+          error_message =
+            QString(tr("MassChroqML compar file name must be set"));
+        }
+    }
+
+  if(error_message.isEmpty())
+    {
+      QDialog::accept();
+    }
+  else
+    {
+      QMessageBox msgBox;
+      msgBox.setWindowTitle(tr("MassChroQ parameter problem"));
+      msgBox.setText(error_message);
+      msgBox.setIcon(QMessageBox::Critical);
+      msgBox.exec();
+    }
+}

src/gui/export/export_masschroq_dialog/exportmasschroqdialog.h

@@ -48,6 +48,7 @@ class ExportMasschroqDialog : public QDialog
   public:
   explicit ExportMasschroqDialog(QWidget *parent);
   ~ExportMasschroqDialog();
+  void accept() override;
 
   void setMasschroqFileParameters(const MasschroqFileParameters &params);
   MasschroqFileParameters getMasschroqFileParameters() const;