Transitiosn and gaps are now added. Also removed unnecessary code

app/core.cpp

@@ -1501,14 +1501,6 @@ void Core::CacheActiveSequence(bool in_out_only)
 bool Core::ValidateFootageInLoadedProject(Project* project, const QString& project_saved_url)
 {
   QVector<Footage*> project_footage = project->root()->ListChildrenOfType<Footage>();
-
-  // OTIO files import their footage into a folder so check them too
-  foreach(Folder * folder, project->root()->ListChildrenOfType<Folder>()) {
-    QVector<Footage*> footage = folder->ListChildrenOfType<Footage>();
-    if (!footage.isEmpty()) {
-      project_footage.append(footage);
-    }
-  }
   QVector<Footage*> footage_we_couldnt_validate;
 
   foreach (Footage* footage, project_footage) {