feat(cpn): refactor handling of erroneous models (#7377)

companion/src/modeledit/modeledit.cpp

@@ -168,5 +168,12 @@ void ModelEdit::onTabIndexChanged(int index)
 
 void ModelEdit::launchSimulation()
 {
+  if (!radioData.models[modelId].isValid()) {
+    QMessageBox::critical(this, tr("Simulate Model"),
+      tr("Operation aborted: model has errors that may affect simulation.\n%1")
+      .arg(radioData.models[modelId].errorsList().join("\n")));
+    return;
+  }
+
   startSimulation(this, radioData, modelId);
 }