Removing intro.md from articles breaks the config

[RedX2501]

Operating System: Windows

DocFX Version Used: 2.56.1

Template used: statictoc

Steps to Reproduce:

Create a default config.
Add an article to the articles folder.
Add the new article to the articles/toc.yml
Remove intro.md from the articles/toc.yml
Remove intro.md
Generate website

Expected Behavior:
Uses the first available article as start location

Actual Behavior:
Tries to find index.html which no longer exists and displays an empty page.

[KalleOlaviNiemitalo]

I can't reproduce this using the reported steps.

If I do not run docfx build before removing the intro.md link from articles/toc.yml, then there is no link to articles/intro.html or articles/index.html anywhere in _site.

If I run docfx build before removing the intro.md link from articles/toc.yml, and again after removing the articles/intro.md file, then _site/articles/intro.html still exists.