Argument exception is thrown if rendere texture is not provided in source dr render texture asset dropdown for Image Sequence recorder. Refer the attached video

Steps to reproduce:
1) Create a new project
2) Window > Package Manager > Install Unity Recorder
3) Add Recorder Image Sequence
4) Capture > Source> Render Texture Asset
5) Start recording

Actual result: Exception is thrown in console as Render texture is not provided

Expected result: No exceptions should be thrown in console

Occurring in: 2021.2.0a3, 2021.1.0b5, 2021.1.0a1, 2020.2.2f1, 2020.1.13f1, 2019.4.9f1

Environment: Both Windows and Mac

Stack trace:
Exception: No Render Texture object provided as source
UnityEditor.Recorder.Input.RenderTextureInput.BeginRecording (UnityEditor.Recorder.RecordingSession session) (at Library/PackageCache/com.unity.recorder@2.5.2/Editor/Sources/Recorders/_Inputs/RenderTexture/RenderTextureInput.cs:33)
UnityEditor.Recorder.Recorder.SignalInputsOfStage (UnityEditor.Recorder.ERecordingSessionStage stage, UnityEditor.Recorder.RecordingSession session) (at Library/PackageCache/com.unity.recorder@2.5.2/Editor/Sources/Recorder.cs:196)
UnityEditor.Recorder.RecordingSession.BeginRecording () (at Library/PackageCache/com.unity.recorder@2.5.2/Editor/Sources/RecordingSession.cs:112)
UnityEditor.EditorApplication:Internal_CallUpdateFunctions()

https://fogbugz.unity3d.com/f/cases/edit/1310538/