Chapters without images leaves a blank space with broken image

Describe the bug

If no image is added to a chapter, an blank space is left. The problem is that some browsers, like Chrome, display a broken image.

2 minor bugs also :

• Chapters is not translated
• The number of chapters is left blank

Steps to reproduce

Example : https://podcast.jplus7.fr/@jplus7/episodes/j7-19-02-2024/chapters

Expected behavior

The episode cover should be the default image, or no image should be displayed if there isn't one.

Actual behavior

Relevant logs and/or screenshots

Context

• Castopod: v 1.10.2
• Browser: Chrome 121.0.6167.185

Possible fixes

[If you can, link to the line of code that might be responsible for the problem]