Parse the variables from template sections to allow optional template variables.
For example when the label field is empty, it should not be rendered:
<img width="702" alt="Xnapper-2023-09-06-13 38 46" src="https://github.com/estruyf/vscode-front-matter/assets/2900833/cb3cf0ea-d37c-484c-a365-cb6004b20821">
When the label field contains data:
<img width="702" alt="Xnapper-2023-09-06-13 39 47" src="https://github.com/estruyf/vscode-front-matter/assets/2900833/032f21fe-5335-4917-bc51-f1b99d1a5ff5">
```
:::{{type}}{{#label}}{{[label}}]{{/label}}
{{&content}}
:::
```
<!-- github-sync-id:1883833419 -->
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Parse the variables from template sections to allow optional template variables.
For example when the label field is empty, it should not be rendered:
When the label field contains data: