The version `void getAsArray(I insert_iter, NullHandling nullhandling = NullHandling::Throw) const`
used the nullhandling param to also throw an error when the whole array is NULL however as
empty arrays are often saved as NULL values and the distinction is often not important
I decided that behaviour was more annoying then useful. You can easily use null() if the
distinction is important.
getAsArrayOfOptional and getAsVector completely forgot to check for NULL value
getAsVector also didn't test for empty strings which appears to be possible
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