fix: show toast error message on ConfigMarkdown parse error

[vvarp]

What does this PR do?

Fixes #8047

This fixes issue #8047 by wrapping ConfigMarkdown.parse() calls in try...catch and displaying appropriate error messages in form of toast

[github-actions]

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

No duplicate PRs found

[rekram1-node]

/review

[rekram1-node]

can u tweak it to match the rest of our style, avoid try catch use .catch instead

[vvarp]

can u tweak it to match the rest of our style, avoid try catch use .catch instead

sure, let me have a closer look

[vvarp]

@rekram1-node should be good now - my python brain went try...catch first hehe

[tenlisboa]

You are repeating the same code in 3 different places, why not create a single helper function to perform this and import/use instead?

[vvarp]

@tenlisboa it was flagged up with automated github-actions review, but @rekram1-node closed that comment with "nah" 😄 - check above