Fix: 修复c++后端服务因为空数组的异常退出，以及c++的http服务在收到Ctrl+C信号后无法正常退出 (#2571)

nianjiuhuiyi

2025-06-27 05c8eba11c51ca928eee9c041de1a4192e590aec

 runtime/onnxruntime/src/funasrruntime.cpp

@@ -297,10 +297,12 @@
         //timestamp
         if(msg_vec.size() > 1){
            std::vector<std::string> msg_stamp = funasr::split(msg_vec[1], ',');
            for(int i=0; i<msg_stamp.size()-1; i+=2){
               float begin = std::stof(msg_stamp[i])+msg_stimes[idx];
               float end = std::stof(msg_stamp[i+1])+msg_stimes[idx];
               cur_stamp += "["+std::to_string((int)(1000*begin))+","+std::to_string((int)(1000*end))+"],";
            if (msg_stamp.size() > 1) {
               for(int i=0; i<msg_stamp.size()-1; i+=2){
                  float begin = std::stof(msg_stamp[i])+msg_stimes[idx];
                  float end = std::stof(msg_stamp[i+1])+msg_stimes[idx];
                  cur_stamp += "["+std::to_string((int)(1000*begin))+","+std::to_string((int)(1000*end))+"],";
               }
            }
         }
      }