Propagate wiki error

What does this MR do and why?

Before	After

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

1. Create a new project (or use one you already have)
2. Enable Wiki
   1. Go to the project settings (left side bar)
   2. Expand Visibility, project features, permissions
   3. Enable Wiki
3. Access the wiki on the left sidebar
4. Create your first page title home with any content
5. Create a second page title home/other with any content
6. Edit the home page, by clicking on it on the right sidebar then on the pencil on the right side of the title
7. Click in save and see the error

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.