未联网状态下，调用getNetCapabilitiesSync接口，程序崩溃

let netHandle = connection.getDefaultNetSync(); 
console.warn(' debug: netHandle = ', JSON.stringify(netHandle)); 
//netid为0，表示没有连接上，返回，就不需要调getNetCapabilitiesSync接口了 
if (netHandle.netId == 0) { 
  console.warn('network not connect.') 
  return ; 
} 
try { 
  let getNetCapabilitiesSync = connection.getNetCapabilitiesSync(netHandle); 
  console.warn(' debug: getNetCapabilitiesSync = ', JSON.stringify(getNetCapabilitiesSync)); 
} catch (error) { 
  console.warn(' debug: error = ', JSON.stringify(error)); 
}