29 scan directory recursive fix

[Valdocco]

We have to check the case when the function returns false if directory is empty.
Otherwise error will be thrown: "array_merge(): Argument #2 is not an array"

[camspiers]

Probably best to check if is is_array as well

[h4cc]

Using !== false will work, because scanDirectory() will either return false || array().

But i think @camspiers hint with white-testing for array may be more fitting.

[Valdocco]

Ok sir, it's true, is_array check is more strict and better therefore

[camspiers]

Looks good to me. Thanks @Valdocco

[h4cc]

@Herzult Merge plz ❓

[Valdocco]

What's about merge?

[Herzult]

Thank you guys!

[fabien-somnier]

@Herzult do you think you will soon create a new release with this bugfix ? tx