Nearby banner: Show item with no image

[nicolas-raoul]

The Nearby banner currently shows the nearest Wikidata item.

Instead, I think it should show the nearest Wikidata item with no image.

Merits:

• Get users to take the most needed pictures
• After the user uploads the item, the banner will start showing a different item, rather than still showing the same one which is uninteresting.

[shashankiitbhu]

I believe I can work on this issue, can you assign this to me?

[shashankiitbhu]

@nicolas-raoul Please Review #5468

[nicolas-raoul]

Ah, sorry for not mentioning this at first, but would you mind also ignoring items that do not exist? Bonus if you can reuse the logic found behind the Nearby activity "Exists" checkbox.

[shashankiitbhu]

Sure, will make these changes in the next commit