Improve exception handling

[IzzySoft]

Two commits, in case you wish to cherry-pick:

• 5a07c85 simply "hides" the PHP Warning on a 404 if an app is not found, and directly returns an empty array
• df9bb95 introduces two new array keys and applies them where appropriate:
  • success: set to 1 if data was successfully retrieved, including all other keys as before
  • message: only added if success==0, giving details on what failed

I was tempted to add a third commit with some cleanup – but knowing my own code I thought you might wish to keep the "notes" 😉

PS: Would love if summary and featureGraphic could be extracted as well, but it seems those are not contained in the scraped page. But if you wish I can check my old scraper for additional details like price, votes etc – just let me know.

[BaseMax]

Good idea.
Merged, Thank you. 👍