Move texture coordinate only if it is selected

src/Application/Application.cpp

@@ -399,8 +399,10 @@ void Application::moveSelection(ofVec2f by){
 		getCmdManager()->exec(new MvSelectionCmd(getSurfaceManager(), by));
 	}else if(_state == TextureMappingMode::instance()){
 		int selectedTexCoord = Gui::instance()->getTextureEditorWidget().getSelectedTexCoord();
+		if(selectedTexCoord >= 0){
 			moveTexCoord(selectedTexCoord, by);
 		}
+	}
 }
 
 void Application::setPresentationMode(){