Unintentional adding of free space before the "templateScript:" breaks the "Pages" app. Only the following error is visible.

 
Steps to reproduce:

1. Add the "my-module" module to your "light-modules" folder.
   my-module.zip
2. Create a page in the "Pages" app and set the "my-page" template for it.
3. Close the "Pages" app.
4. Find and modify the "/my-module/templates/pages/my-page.yaml" file.
5. Add free space/s before the row with: "templateScript:" and save changes.
   
6. Again open the "Pages" app.
7. The error is there.

Log: log.txt

+ in Magnolia 6.1:

• you cannot then close the "Pages" app because the "cross" button is missing,
• the exclamation mark icon is too small,
• the window for the "Notification text" is too small: (especially if you have a big monitor and the rest of the space under the window is white)