catch exception from libff (to be ctd)

GUI/Model/FromCore/GUIExamplesFactory.cpp

@@ -67,7 +67,7 @@ SampleItem* GUI::ExamplesFactory::itemizeSample(const QString& name)
 {
     ASSERT(isValidExampleName(name));
     MultiLayer* sample = std::get<2>(builders[name])();
-
+    ASSERT(sample);
     return GUI::FromCore::itemizeSample(*sample, name);
 }
 

GUI/View/View/SampleView.cpp

@@ -21,6 +21,7 @@
 #include "GUI/Model/Sample/ParticleLayoutItem.h"
 #include "GUI/Model/Sample/SamplesSet.h"
 #include "GUI/View/Base/mainwindow_constants.h"
+#include "GUI/View/Info/MessageBox.h"
 #include "GUI/View/IO/PythonImport.h"
 #include "GUI/View/Modelview/SetView.h"
 #include "GUI/View/Realspace/RealspacePanel.h"
@@ -166,12 +167,15 @@ void SampleView::createActions(QToolBar* toolbar)
         auto* action = import_menu->addAction(icon, title);
         action->setToolTip(description);
         connect(action, &QAction::triggered, [this, exampleName, title, description] {
-            SampleItem* t = GUI::ExamplesFactory::itemizeSample(exampleName);
-            if (!t)
-                return;
-            t->setName(title);
-            t->setDescription(description);
-            m_set->add_item(t);
+            try {
+                SampleItem* t = GUI::ExamplesFactory::itemizeSample(exampleName);
+                ASSERT(t);
+                t->setName(title);
+                t->setDescription(description);
+                m_set->add_item(t);
+            } catch (const std::exception& ex) {
+                GUI::Message::warning("Cannot load exemplary sample", ex.what());
+            }
         });
     }