HTML cleaner removes references to internal documents.

Scenario:

1. Go to xmas tree document in Hap.
2. Change some field (not html).
3. Save changes.
4. Investigate Introduction HTML feld.

Expected: 3 working references on internal documents.

Current result: 3 broken references.

5. Go to content perspective and press save and close.

Result: Exception in terminal. Failed to resolve path http:// relative to node /content/documents/hap/xmas-tree/xmas-tree[3]/hap:introduction