Tag name is accepted as blank/empty space in the "Tag Control" window and it displays as a line separator in the "Tag List" when right-click on "Tag" column under "Android Logcat" window, refer attached screenshot

Steps to repro:
1. Create a new project.
2. Window > Package Manager > Android Logcat (1.0.0) > Install
3. Window > Analysis > Android Logcat
4. Tag column > right-click > Tag Controls
5. Add Tag Name with empty spces > Add
6. Android Logcat > Tag column > right-click

Actual Result:
Blank input is accepted as Tag name and it displays as a line separator in the "Tag List" when right-click on "Tag" column under "Android Logcat" window

Expected Result:
Blank input should not be accepted

Note: Tag Control functionality introduced in preview - 0.2.7

Tested with Unity Version:
2020.1.0a15, 2019.3.0f1

Package version found: preview - 1.0.3, 1.0.0, preview - 0.2.7

Environment:
Windows 10 & macOS 10.14.