Omit rendering for rating/downloads of an extension if 0

[kaiyue0329]

What it does

Fixes: #7376
Fixes #7423

The pull-request addresses the following:

• Omit the rendering for rating/downloads of an extension in the extension tree if it is equal to 0
• Omit the rendering for downloads in extension editor if it is equal to 0
• Render the star icons for published extension in extension editor even if rating equals to 0
• Updates the font-family for the download count when viewing an extension's information

How to test

• Click View in the top menu and select Extensions
• Search for Omi Snippets
• The 0 rating for should no longer be there

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• as a reviewer, I agree to behave in accordance with the review guidelines

[vince-fugnitto]

@kaiyue0329 the changes look good to me, I verified and did not see any rating/download when the value is 0 (undefined). I also verified that the rating/download is displayed when providing mock data.

[akosyakov]

There is also an issue in the extension editor:

But it has to work a bit different:

• for rating it is fine to show 5 empty stars
• for downloads it should be omitted

[kaiyue0329]

@akosyakov I enforced the rating here to be undefined for built-ins like this:

get averageRating(): number | undefined {
  return !this.builtin ? this.getData('averageRating') : undefined;
}

since the 0 rating was showing up for some of the built-ins

[akosyakov]

@kaiyue0329 it is not correct, if built-in is published to the registry then it should show rating

[akosyakov]

it looks great now, thank you!

[vince-fugnitto]

Merging! Thank you @kaiyue0329 :)