fix #11 pass empty string to strpos() instead of null

[gigerIT]

Fixes: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in vendor/fruitcake/php-cors/src/CorsService.php on line 108

[barryvdh]

How does your config look like? An array with an explicit null value?

[gigerIT]

Yes we have some entries that are only applied when the app/env is in debug mode.

'allowed_origins' => ['prod.domain.com', config('app.debug') ? '*.pages.dev' : null],

I guess we also could use '' instead of null.

[barryvdh]

I'm inclined to think you shouldn't pass a null version.

[mfn]

You can keep the null and wrap the whole [] in array_filter()