do not call initWindow() on failed load

include/lib/orderedjson.h

@@ -51,7 +51,8 @@
  * THE SOFTWARE.
  */
 
-#pragma once
+#ifndef ORDERED_JSON_H
+#define ORDERED_JSON_H
 
 #include <QString>
 #include <QVector>
@@ -240,3 +241,4 @@ protected:
 
 } // namespace poryjson
 
+#endif // ORDERED_JSON_H

include/mainwindow.h

@@ -262,6 +262,7 @@ private:
 
     bool isProgrammaticEventTabChange;
     bool projectHasUnsavedChanges;
+    bool projectOpenFailure = false;
 
     MapSortOrder mapSortOrder;