disable ui when no project is open (closes #281)

src/mainwindow.cpp

@@ -71,6 +71,9 @@ void MainWindow::initWindow() {
     this->initMiscHeapObjects();
     this->initMapSortOrder();
     this->restoreWindowState();
+
+    setDisabled(true);
+    ui->menuFile->setDisabled(false);
 }
 
 void MainWindow::initExtraShortcuts() {
@@ -370,6 +373,8 @@ bool MainWindow::openProject(QString dir) {
         Scripting::cb_ProjectOpened(dir);
     }
 
+    setDisabled(false);
+
     return success;
 }