Fix optimistic response for cached games

[GuilleAngulo]

Issue

At the explore page, the apollo cache is used to store the games and the optimistic response with the empty game is being pushed inside the cache overwriting the game fragment and producing a flash (with an empty game). This only happens here, as the other pages are not using the cache to store the games (index, game/[slug], ...).

Proposed Solution

In order to fix it, the optimisticGameResponse is modified to read the game fragment from cache (by using the id) and an optimistic response is created based on it if available. Otherwise, it will continue creating an empty structure response with the id as it does not have a negative impact when the game is not cached. This way both cases (with cache and without) are covered.

Hopefully now everything is working as expected.

[willianjusten]

Awesome work! Tested and now works perfectly!

[GuilleAngulo]

Greeat! Thanks!