Question Handling sound load error when getting it from local source

Hi,
My app plays AudioClips from resource by default but offers the users the possibility to override them with local sounds.

Code (CSharp):

1. public class AudioManager : MonoBehaviour
2. {
3.     // User sounds
4.     Dictionary<string, AudioClip> UserSoundFiles = new Dictionary<string, AudioClip>();
5.     private string SoudFolderPath;
6.  
7.     void Start()
8.     {
9.         SoundFolderPath = Path.GetFullPath(Path.Combine(Path.GetDirectoryName(Application.dataPath), @"Sounds\"));
10.         LoadUserSoundFiles();
11.     }
12.  
13.     private void LoadUserSoundFiles()
14.     {
15.         UserSoundFiles.Add("Panel_Open.wav", null);
16.         UserSoundFiles.Add("Panel_Close.wav", null);
17.  
18.         foreach (KeyValuePair<string, AudioClip> kvp in UserSoundFiles)
19.         {
20.             if (File.Exists(SoundFolderPath + kvp.Key))
21.             {
22.                 StartCoroutine(GetAudioClip(kvp.Key));
23.             }
24.         }
25.     }
26.  
27.     IEnumerator GetAudioClip(string key)
28.     {
29.         using (UnityWebRequest www = UnityWebRequestMultimedia.GetAudioClip(SoundFolderPath + key, AudioType.WAV))
30.         {
31.             yield return www.SendWebRequest();
32.  
33.             if (www.isHttpError || www.isNetworkError)
34.             {
35.             }
36.             else
37.             {
38.                 AudioClip ac = DownloadHandlerAudioClip.GetContent(www);
39.                 UserSoundFiles[key] = ac;
40.             }
41.         }
42.     }
43.  
44.     public void playPanelOpen()
45.     {
46.         if (UserSoundFiles["Panel_Open.wav"] != null)
47.         {
48.             UIsounds.PlayOneShot(UserSoundFiles["Panel_Open.wav"]);
49.             return;
50.         }
51.         UIsounds.PlayOneShot(Resource_Panel_Open);
52.     }
53.     public void playPanelClose()
54.     {
55.         if (UserSoundFiles["Panel_Close.wav"] != null)
56.         {
57.             UIsounds.PlayOneShot(UserSoundFiles["Panel_Close.wav"]);
58.             return;
59.         }
60.         UIsounds.PlayOneShot(Resource_Panel_Close);
61.     }
62. }

This is working fine. If a local sound file is present it is loaded then possibly played, otherwise the resource sound is played.
...but I wanted to know what would happen with a 'bad' .wav file, so I created a text file names 'Panel_Open.text' that I next renamed to 'Panel_Open.wav' to see what would happen.

It appears that Unity is indeed rising this error

Error: Cannot create FMOD::Sound instance for resource 0x0000000004BB7350: C:\Users\...\Desktop\Unity\Data\Sounds\Select.wav, (Unsupported file or audio format. )

UnityEngine.Networking.DownloadHandlerAudioClip:GetContent(UnityWebRequest)

...but UserSoundFiles["Panel_Close.wav"] is not null anymore and there is an attempt to read it in 'playPanelOpen()'

I hope it's clear so far The question is: how could I catch the error from DownloadHandlerAudioClip.GetContent(www) and set the AudioClip to null in this case?

Thank you!