comparison framework/Document.cpp @ 61:215b8b1b0308

* Add Erase tool and mode
* Add icons for Normalize buttons in property boxes, and for Show Peaks
* Add support for velocity in notes -- not yet reflected in display or
  editable in the note edit dialog, but they are imported from MIDI,
  played, and exported
* Begin work on making pastes align pasted times (subtler than I thought)

 }
 
 Layer *
 Document::createEmptyLayer(LayerFactory::LayerType type)
 {
+    if (!m_mainModel) return 0;
+
     Model *newModel =
 	LayerFactory::getInstance()->createEmptyModel(type, m_mainModel);
     if (!newModel) return 0;
 
     Layer *newLayer = createLayer(type);