Improve layout for missing chapter images

[flofriday]

Description

If only some chapters have images the other chapters don't display anything but reserve space for the image.

Now those chapters display the image of the episode. If no chapters have images no images will be displayed (just like before).

Checklist

• [x] I have read the contribution guidelines: https://github.com/AntennaPod/AntennaPod/blob/develop/CONTRIBUTING.md#submit-a-pull-request
• [x] I have performed a self-review of my code
• [x] I have run the automated code checks using ./gradlew checkstyle spotbugsPlayDebug spotbugsDebug :app:lintPlayDebug
• [x] My code follows the style guidelines of the AntennaPod project: https://github.com/AntennaPod/AntennaPod/wiki/Code-style
• [x] I have mentioned the corresponding issue and the relevant keyword (e.g., "Closes: #xy") in the description (see https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue)
• [x] If it is a core feature, I have added automated tests

Alternative Implementation: We could also just remove the reserved space if the chapter has no image. This means that the items wouldn't be aligned but chapters without images would have more space to display information. This is not my preferred solution but I am happy to hear your feedback.

Screenshots: left: current, middle: preferred solution (this PR) right: alternative implementation

[flofriday]

Also another question, why is there a refresh button in the dialog? Does it refresh the chapter parsing? Or does it reload the episode? Or just the chapter information?

[ByteHamster]

Thanks!

why is there a refresh button in the dialog?

It's shown when the podcast uses Podcasting2.0 chapters, which are not encoded in the media file but in a json file on some web server. AntennaPod caches that json file quite aggressively but you can press the button to reload.