Bug in Param settings UI of Node

[itutu-tienday]

再現手順

1. Node のPARAMメニュー（右サイド）を表示し、リスト値のフィールドにフォーカスを当てる （例: optinist/dimension_reduction/dpca の trigger_duration など）

2. 1. のフィールドからフォーカスを外すと、Frontで以下の例外が発生。

   Uncaught runtime errors:
   
   ERROR
   
   value.split is not a function
   TypeError: value.split is not a function
       at splitValue (http://localhost:3001/static/js/bundle.js:23310:39)
       at onBlur (http://localhost:3001/static/js/bundle.js:23322:58)
       at handleBlur (http://localhost:3001/static/js/bundle.js:59055:7)
       at HTMLUnknownElement.callCallback (http://localhost:3001/static/js/bundle.js:403270:18)
       at Object.invokeGuardedCallbackDev (http://localhost:3001/static/js/bundle.js:403314:20)
       at invokeGuardedCallback (http://localhost:3001/static/js/bundle.js:403371:35)
       at invokeGuardedCallbackAndCatchFirstError (http://localhost:3001/static/js/bundle.js:403385:29)
       at executeDispatch (http://localhost:3001/static/js/bundle.js:407529:7)
       at processDispatchQueueItemsInOrder (http://localhost:3001/static/js/bundle.js:407555:11)
       at processDispatchQueue (http://localhost:3001/static/js/bundle.js:407566:9)

[itutu-tienday]

再現動画

• screencast-20240227161415.webm