🐛 Bug Report

The latest version of D2 fails to build if markdown links or images contain an empty URL value. A build may also fail if a relative URL value path cannot be resolved.

Have you read the Contributing Guidelines on issues?

Yes.

To Reproduce

(Write your steps here:)

1. Add a markdown link or image to a doc with an empty URL value.
2. Attempt to perform a dev server start or production build.

Expected behavior

Inherit the onBrokenMarkdownLinks setting. For example, if set to warn then error should be displayed as a warning and dev server or build should continue.

(Write what you thought would happen.)

Actual Behavior

Seeing the following errors:

• Error: Markdown link url is mandatory.
• Error: Markdown Image url is mandatory.

(Write what happened. Add screenshots, if applicable.)

Your Environment

• Docusaurus version used: alpha 70
• Environment name and version (e.g. Chrome 78.0.3904.108, Node.js 10.17.0): Chrome 87.0.4280.88, Node.js 14.x
• Operating system and version (desktop or mobile): MacOSX 10.15.7

Reproducible Demo

demisto/content-docs#429