Description:
Confusing message from Package Inspector window `This package and all its assets will be... `

Reproduction steps:
1. In the Package Manager Window, select a mutable package.
2. With the package selected, open the Inspector Window.
3. Click on the Edit button and scroll to the bottom of the Inspector Window and observe warning message.

Actual Result:
A warning will be shown depending on the value of the package manifest type field. For example, when the package type has no value, it will show the message: This package and all its assets will be hidden by default in Editor because its type is empty

Expected Result:
No warning is shown