[Bug] Inspector Bug on Audio Asset missing

[StinkySteak]

The inspector will not draw if the audio file is missing. Thus we have to go to debug mode to fix it, because anything is not clickable

Steps To Reproduce

1. Create a sound File Object
2. Attach an Audio into It
3. Delete the Audio Asset

NullReferenceException: Object reference not set to an instance of an object
JSAM.JSAMEditor.SoundFileObjectEditor.OnInspectorGUI () (at Library/PackageCache/com.brogrammist.jsam@89243ec951/Editor/SoundFileObjectEditor.cs:291)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass59_0.<CreateIMGUIInspectorFromEditor>b__0 () (at <cd89fd1ce037419f95985196f5aeee4d>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)

Unity Version: 2021.21f1
JSAM: 3.0.0-preview 6

[jackyyang09]

Sorry for the delay, this issue has now been fixed as of Version 3.0.1