Category “Addins” still present on Add Command dialog of VS 2015

Although VS 2015 removed support for add-ins and the Tools > Add-In Manager of past versions was removed, there is still at least one place where its past existence surfaces:

Click the Tools > Customize… menu to show the Customize dialog and click the Commands tab:


Then click the Add Command… button and you will see the Addins item in the Categories list:


I have reported this minor bug on Microsoft Connect.