Add `surfaceUnselectedevent to `SurfaceManager`

src/Surfaces/SurfaceManager.cpp

@@ -199,7 +199,10 @@ void SurfaceManager::selectVertex(int i){
 	}
 	
 	if(i > selectedSurface->getVertices().size() - 1){
-		ofLogError("SurfaceManager::selectVertex") << "index out of bounds" << endl;
+		ofLogError("SurfaceManager::selectVertex") << "index (" << i << ") out of bounds" << endl;
+		int prevVertIndex = _selectedVertexIndex;
+		ofNotifyEvent(vertexUnselectedEvent, prevVertIndex, this);
+		_selectedVertexIndex = -1;
 		return;
 	}
 	

src/Surfaces/SurfaceManager.h

@@ -57,6 +57,7 @@ class SurfaceManager {
 		ofEvent <vector<ofVec3f>> verticesChangedEvent;
 		ofEvent <int> surfaceSelectedEvent;
 		ofEvent <int> vertexSelectedEvent;
+		ofEvent <int> vertexUnselectedEvent;
 
 		void onVertexChanged(int & i);
 		void onVerticesChanged(vector<ofVec3f> & vertices);