Fix "exit" row

stepmania/src/ScreenOptionsMaster.cpp

@@ -472,6 +472,8 @@ void ScreenOptionsMaster::ExportOptions()
 	m_NextScreen = "";
 
 	const int row = this->GetCurrentRow();
+	if( row < (int) OptionRowHandlers.size() ) /* might be on "exit" */
+	{
 		const OptionRowHandler &hand = OptionRowHandlers[row];
 		if( hand.type == ROW_LIST )
 		{
@@ -480,6 +482,7 @@ void ScreenOptionsMaster::ExportOptions()
 			if( mc.m_sScreen != "" )
 				m_NextScreen = mc.m_sScreen;
 		}
+	}
 
 	// NEXT_SCREEN(GAMESTATE->m_PlayMode) );
 	// XXX: handle different destinations based on play mode?