Argument exception is thrown if tag is empty 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 > Camera > Tagged Camera > Keep the tag empty
5) Start recording

Actual result: Argument exception is thrown in console because of empty tag

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:
ArgumentException: Tag: tag name is null or empty.
UnityEditor.Recorder.Input.CameraInput.NewFrameStarting (UnityEditor.Recorder.RecordingSession session) (at Library/PackageCache/com.unity.recorder@2.5.2/Editor/Sources/Recorders/_Inputs/Camera/CameraInput.cs:300)
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:200)
UnityEditor.Recorder.RecordingSession.PrepareNewFrame () (at Library/PackageCache/com.unity.recorder@2.5.2/Editor/Sources/RecordingSession.cs:206)
UnityEditor.Recorder.RecorderComponent:LateUpdate() (at Library/PackageCache/com.unity.recorder@2.5.2/Editor/Sources/_RecorderComponent.cs:13)

[https://fogbugz.unity3d.com/f/cases/edit/1310536]