Blank submitted answer is confusing for pl-file-editor about prairielearn HOT 5 OPEN

For pl-file-editor the typical use is that you can add to the bottom of your question.html:

<pl-submission-panel>
  <pl-file-preview></pl-file-preview>
</pl-submission-panel>

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If you want to see a formatted preview of your markdown submission instead, you can use:

<pl-submission-panel>
   <pl-xss-safe submitted-file-name="set1.md" language="markdown"></pl-xss-safe>
</pl-submission-panel>

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I'll do that in the future; thanks! For folks who do not use this though, I wonder if one of the three options above might be a better default than a blank box? Most other elements show some representation of the submitted answer by default rather than a blank box.

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@mwest1066 can probably talk to this further, but I believe changing this now may affect a lot of courses that rely on the current behavior.

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I agree that the current behavior is not good, and that we really should have some kind of default submission display. The backward compatibility problem that @jonatanschroeder mentions is definitely a problem, however. @nwalters512 tagging you in on this in case you've got any good ideas.

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