Throw exception instead of getting a php warning

[Daemant]

When I accidentally tried to call a loaded, but not started resource on game server, I got a non-handleable invalid argument php warning inside the page body:

Warning: Invalid argument supplied for foreach() in vendor\multitheftauto\mtasa-php-sdk\src\Transformer\ElementTransformer.php on line 34

This will replace it with an exception which can be handled by code

[ecastro98]

Thanks for the contribution, I really appreciate it. Sorry for the delay, I was a bit busy lately.

[Daemant]

Yes, I agree that this looks cleaner, so let's apply it.

[ecastro98]

Thanks @Daemant !