Ensure the config is valid before subscribing to events

[mcaskill]

Prevents an error in EnvatoPlugin:

Call to a member function getDownloadUrl() on null

This error is the result of the EnvatoApi not being set up when the config is invalid but events still being subscribed to.

[szepeviktor]

Thank you.
The fix is correct.

[mcaskill]

🤦 The fix is not correct; the getSubscribedEvents() method is static. Sorry about that. I'll push a better correction soon.

[mcaskill]

I can either move the config validity check to handlePreDownloadEvent():

public function handlePreDownloadEvent(PreFileDownloadEvent $event): void
{
    if ($event->getType() !== 'package' || ! $this->config->isValid()) {
        return;
    }

Or change the $config property to be static.

[szepeviktor]

Oh noooooooooooooooooooooooooooooooooooooooooooooooooooooooo!

I leave it 100% up to you.
This PR is not yet released :)

[szepeviktor]

Please run composer run analyze before that PR.