Whitespace within ```title:``` doesn't give a reasonable error message

[julhe]

What is the current behavior? A node like this:

title: Title with Whitespace
---
Some text.
===

will not compile, but also don't point to the specific location of the error.

Please provide the steps to reproduce, and if possible a minimal demo of the problem:

with no information on where the issue occured.

What is the expected behavior?

A explicit error message of where this error occured.

Please tell us about your environment:

• Yarn Spinner Version: N/A
• Unity Version: N/A
• Yarn VS-Code: last update 2/6/2023, 22:37:08

Other information

N/A

[desplesda]

Fixed in c3daf30d2baeea3e1dd4a3f2f48f7fc45c4771f8; an updated version of the VS Code extension that contains this fix is available in pre-release.