Clicking on "Prefab Index" in Search, editor thrown ArgumentException, when prefab is not selected refer to the attached video.

Steps to repro:
1. Create a new project
2. Project > Create > Search > Prefab Index

Actual Result:
ArgumentException is thrown on creating Search Prefab Index

Expected Result:
Prefab Index option should be disabled if Prefab assets is not selected

Occurring on:
2021.1.0a1,
2020.2.0b7 with Quick Search Package Version 3.0.0-preview.1

Working Fine:
2020.2.0b7 with Quick Search 2.1.0-preview.4

Note: Quick Search is a Built-In Package in the Unity 2021.1.0a1

Environment:
Occurring on Windows 10 & macOS 10.15.

Stack trace:
ArgumentException: Path is empty
System.IO.Directory.CreateDirectory (System.String path) (at <9577ac7a62ef43179789031239ba8798>:0)
UnityEditor.Search.SearchDatabaseImporter.CreateTemplateIndex (System.String template, System.String path, System.String name) (at <972f91fb203a4724acd4146bb9f4aedd>:0)
UnityEditor.Search.SearchDatabaseImporter.CreateIndexPrefab () (at <972f91fb203a4724acd4146bb9f4aedd>:0)