gathering data from Steam API is ignoring too many apps

In get_apps_data.py in function gatherDataForApp: Sometimes (I haven't figured out yet when exactly) we get into the except block but that shouldn't be the case.

See app ID 1415120 as an example: Function went into the except block but calling it now does not throw a JSONDecodeError

Expected behaviour: Only go into the except block when the app ID got a response (because it wasn't caught in the loop) but it's not JSON (-> JSONDecodeError)

Actual behaviour: Went into the except block even when the response did not throw a JSONDecodeError after trying the ID manually with steampowered.com/app/app_id.

Possible fix: I guess that it happens when the API got overloaded with requests. If that's the case then adding time.sleep() in the except block and looping over it should do the trick