Managing empty questions state

[alexfauquette]

We have multiple logo games that interact together. To help users discover them, we could add link between them, especially when their is not more question to answer and the user don't know what to do.

The games

Let's take a logo (nutriscore E)

You can collect data about it with the following games:

• Questions (the more generic one, where you have to answer Yes or No): https://hunger.openfoodfacts.org/questions?type=label&value_tag=en%3Anutriscore-grade-e
• Logo Questions where you are focused on cropped logos: https://hunger.openfoodfacts.org/logoQuestion/en:nutriscore-grade-e
• Infinite logo annotation where annotating logos add more similar logos to annotate: https://hunger.openfoodfacts.org/logos/deep-search?type=label&value=en%3Anutriscore-grade-e
• Logo search per product (We get logos from products having the logo to help users find some of them): https://hunger.openfoodfacts.org/logos/product-search?tag=en%3Anutriscore-grade-e

How to link them:

If "Infinite logo annotation" is empty, it means we do not have any logo example for this value. So it should encourage users to use the "Logo search per product" to find some examples. (#469)

If "Logo Questions" is empty, it means all the logos detected automatically are annotated. Then they can use "Infinite logo annotation" to annotate more logos in a manual way (#420)