Prevent runtime_error exceptions from plugins crashing the main app (#…

…812)

Catch runtime_error exceptions thrown from the plugins and skip the throwing plugins, so that the main app can continue its normal operation.

plotjuggler_app/mainwindow.cpp

@@ -618,7 +618,16 @@ QStringList MainWindow::initializePlugins(QString directory_name)
 
     QPluginLoader pluginLoader(pluginsDir.absoluteFilePath(filename), this);
 
-    QObject* plugin = pluginLoader.instance();
+    QObject* plugin;
+    try
+    {
+      plugin = pluginLoader.instance();
+    }
+    catch (std::runtime_error& err)
+    {
+      qDebug() << QString("%1: skipping, because it threw the following exception: %2").arg(filename).arg(err.what());
+      continue;
+    }
     if (plugin && dynamic_cast<PlotJugglerPlugin*>(plugin))
     {
       auto class_name = pluginLoader.metaData().value("className").toString();