[Bugfix] Re-enable array_get to fetch "flat" array keys containing dots. #645
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Fixes an issue introduced with #530, when using array_get to fetch flat array keys containing dots. These are used by e.g. Symony's Translation Component:
Example taken from Symfony Translation Docs.
This PR simply makes array_get check if the array key exists (and return its value if true), before attempting to iterate through the array using the keys "dot"-notation.