Show UI feedback when format / extension are incorrect

[privatemaker]

I encountered the following issue whereby the config did not show an error (which makes sense) and the UI shows This collection has no entries yet. My collection settings were:

collections:
  - label: "Widgets"
    name: "widgets"
    folder: "content/widgets/"
    extension: "md"
    format: "yaml"

The UX bug (as I would call it) is that Sveltia did not return content in the UI nor inform the user as to why there was no content.

I assumed this is because Sveltia tried to parse the entire file as yaml but since it was a .md + frontmatter file, Sveltia failed silently. Converting the files .yaml and updating extension: "yaml" worked, but incorrect for my SSG.

Changing the value to format: "frontmatter" makes all the data correctly show, as expected 😄

Suggestions

1. Show user friendly message in UI

## Oops

We found content, but were unable to display it.
Please make sure your settings and files are correct:

folder: "content/widgets/"
extension: "md"
format: yaml

2. Console log a parsing error (if there is?) such as this so there's a clue.

Relates to #17 but I think is discreet enough to warrant a separate issue and path to resolution.

[kyoshino]

Agreed! I’ll at least add a collection-level validation in the near future, including those format inconsistencies, duplicate collection names, etc.