removing console.log and fixing issues with Details Component

[bbansalWolfPack]

Hello Brian

First of all thanks for the awesome tutorials, big fan.

While running the repo and going through tutorial, I found two issues for which I am creating this pull request.

1. Console.log message in one component so thought to remove that
2. In details component, when we make the api call to get details about a pet. I saw that some links returns 404 Error but the logic to handle them is missing. Even with 404, looks like api marks that promise a success because of which it shows in .then block where it fails as animal is undefined there. I added a catch block which sets loading to false and then the Error boundary takes over. Otherwise I was just seeing Loading on the screen which never gets to false.

Adding screenshot for the same.