Return original expression for non-matching regex in find_field_with_sort_order

• Updated the find_field_with_sort_order function to return (expression, None) when the regex doesn't match.
• This provides clearer feedback by preserving the original expression.

--HG-- branch : 16.0

added 1 commit

• a56cf50519d5 - Added tag 16.0.1.2.2 for changeset 529370efc56b

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