Add loading to PieChart when it is empty

[warnerHurtado]

Epic: As a guest and member, I want to see a loading when the Piechart doesn't have data.

Criteria: The main purpose of this feature is to improve user experience.

-Image for given an example

Tasks:

• [ ] Add the loading to the PieChart
• [ ] Fix style Charline title
• [ ] Testing the feature