Check if fb_api_key is set before calling it

[legoblokje]

When PHP notices are on (or when WP_DEBUG is on) line 835 in facebook-commerce.php produces a warning (Undefined index: fb_api_key) when the plug-in isn't setup yet. This in turn generates a JavaScript error which leaves the user unable to start initial setup.

I added a fix which checks if the fb_api_key is set before calling it.

[facebook-github-bot]

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[rawdreeg]

I am closing this PR as stale.