No design displayed for some themes on mobile

[ValentinaPC]

Steps to reproduce:

1. Load AMO-dev on your Android device and search something i.e. "wild" (https://addons-dev.allizom.org/en-US/android/search/?q=wild)
2. Scroll through results and observe all themes

Expected results: Every theme has a design.

Actual results: Some themes don't have a design.

Notes/Issues:

• on desktop those exact themes have a design Examples:
  1. https://addons-dev.allizom.org/en-US/android/addon/wild-horses-by-redbud/?src=ss
  2. https://addons-dev.allizom.org/en-US/android/addon/c-e-wild-horses/?src=ss
  3. https://addons-dev.allizom.org/en-US/android/addon/joker-is-wild/?src=ss
  4. https://addons-dev.allizom.org/en-US/android/addon/catching-fire-peeta-katniss/?src=ss etc.

Verified on FF51(Android 6.0.1). Screenshots for this issue:

[muffinresearch]

This might be resolved by https://github.com/mozilla/addons/issues/10105

[ValentinaPC]

Unfortunately this was not fixed by mozilla/addons#10105. There are still some themes that have no design preview after search. I.e:

Notes:

• refreshing the page in theme details will make the design visible
• theme design will remain "invisible" in search results page or the second time we access theme details page.

See video:

[muffinresearch]

This is due to the image files being 404. I think this might be a data problem or data import related.

[muffinresearch]

I'll investigate this one to see what's going on.

[muffinresearch]

Having added a test theme the images appeared to be generated correctly. I think this is purely a data issue but we should re-open this if we see it on stage.

[ValentinaPC]

This seems to be fixed in mozilla/addons#10194 . Verified as fixed in AMO-dev FF51(Android 6.0.1). Postfix video: