fix crash on open folder

juci/directories.cc

@@ -6,7 +6,7 @@ Directories::Controller::Controller(Directories::Config& cfg) :
   m_ScrolledWindow.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
 }
 
-bool Directories::Controller::
+void Directories::Controller::
 open_folder(const boost::filesystem::path& dir_path) {
   m_refTreeModel = Gtk::TreeStore::create(view());
   m_TreeView.set_model(m_refTreeModel);

juci/directories.h

@@ -48,7 +48,7 @@ namespace Directories {
     Model& model() { return model_;}
     Directories::Config& config() { return config_;}
     Gtk::ScrolledWindow& widget() {return m_ScrolledWindow;}
-    bool open_folder(const boost::filesystem::path& dir_path);
+    void open_folder(const boost::filesystem::path& dir_path);
     void list_dirs(const boost::filesystem::path& dir_path,
                    Gtk::TreeModel::Row &row, unsigned depth);
     std::string get_project_name(const boost::filesystem::path& dir_path);