dashfolders: create app folder on dashboard import

pkg/plugins/dashboards.go

@@ -108,3 +108,13 @@ func loadPluginDashboard(pluginId, path string) (*m.Dashboard, error) {
 
 	return m.NewDashboardFromJson(data), nil
 }
+
+func getPlugin(pluginId string) (*PluginBase, error) {
+	plugin, exists := Plugins[pluginId]
+
+	if !exists {
+		return nil, PluginNotFoundError{pluginId}
+	}
+
+	return plugin, nil
+}