try catch added when building the tandem run dialog

src/gui/mainwindow.cpp

@@ -365,17 +365,24 @@ MainWindow::doProjectNotReady(QString error)
 void
 MainWindow::doActionTandemRun()
 {
-  if(_p_tandem_run_dialog == nullptr)
+  try
+    {
+      if(_p_tandem_run_dialog == nullptr)
+        {
+          _p_tandem_run_dialog = new TandemRunDialog(this);
+          connect(_p_tandem_run_dialog,
+                  &TandemRunDialog::accepted,
+                  this,
+                  &MainWindow::doAcceptedTandemRunDialog);
+        }
+      _p_tandem_run_dialog->show();
+      _p_tandem_run_dialog->raise();
+      _p_tandem_run_dialog->activateWindow();
+    }
+  catch(pappso::PappsoException &error)
     {
-      _p_tandem_run_dialog = new TandemRunDialog(this);
-      connect(_p_tandem_run_dialog,
-              &TandemRunDialog::accepted,
-              this,
-              &MainWindow::doAcceptedTandemRunDialog);
+      viewError(tr("Error opening X!Tandem run dialog window :\n%1").arg(error.qwhat()));
     }
-  _p_tandem_run_dialog->show();
-  _p_tandem_run_dialog->raise();
-  _p_tandem_run_dialog->activateWindow();
 }
 void
 MainWindow::loadResults()