Check if model ptr is live to prevent crashing when triggering model updates...

Check if model ptr is live to prevent crashing when triggering model updates AND cleaning up existing models

src/infinitecalendarviewmodel.cpp

@@ -32,11 +32,15 @@ InfiniteCalendarViewModel::InfiniteCalendarViewModel(QObject *parent)
             for (auto &model : m_models) {
                 if (model.modelType != TypeWeek) {
                     for (const auto &startDate : std::as_const(model.affectedStartDates)) {
-                        model.multiDayModels->value(startDate)->model()->updateQuery();
+                        if (model.multiDayModels->value(startDate) != nullptr) {
+                            model.multiDayModels->value(startDate)->model()->updateQuery();
+                        }
                     }
                 } else {
                     for (const auto &startDate : std::as_const(model.affectedStartDates)) {
-                        model.weekModels->value(startDate)->model()->updateQuery();
+                        if (model.weekModels->value(startDate) != nullptr) {
+                            model.weekModels->value(startDate)->model()->updateQuery();
+                        }
                     }
                 }
             }