Add convenient way to get optional meta value

Description

When meta value is exatrcted, the current implementation returns an empty string if meta with the provided key is not found:

It's not convenient since there is no way to distinguish the non-present meta and meta with an empty value.

New method based on Java 8 Optional should be added to close the described gap

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Created January 25, 2021 at 4:05 PM
Updated April 26, 2022 at 2:12 PM
Resolved January 25, 2021 at 4:41 PM