Do not create `RmGridRowCmd` if surface rows are <= 1

src/Application/ProjectionMappingState.cpp

@@ -84,6 +84,7 @@ void ProjectionMappingState::onKeyPressed(Application * app, ofKeyEventArgs & ar
 			if(app->getSurfaceManager()->getSelectedSurface()->getType() ==
 				SurfaceType::GRID_WARP_SURFACE){
 				
+				if(((GridWarpSurface *)app->getSurfaceManager()->getSelectedSurface())->getGridRows() > 1){
 					// TODO: The command should not require projection editor pointer
 					app->getCmdManager()->exec(
 						new RmGridRowCmd(
@@ -91,6 +92,7 @@ void ProjectionMappingState::onKeyPressed(Application * app, ofKeyEventArgs & ar
 							app->getGui()->getProjectionEditor() ));
 				}
 			}
+		 }
 		 break;
 	 
 	 case ']':