BUG: Default parameters allowed incorrect usage
Slicer/Modules/Loadable/Models/qSlicerModelsModule.cxx:165:44: warning: 'this' pointer cannot be null in well-defined C++ code; pointer may be assumed to always convert to true [-Wundefined-bool-conversion] QStringList() << "vtkMRMLModelNode", this)); ^~~~
The 'this' pointer was interpreted as boolean. To ensure complete proper usage, the default parameters were removed, thus forcing compiler errors that were easy to identify and fix.