Fix SQL formatting bug where a newline is missing after a single-line comment

[openai0229]

Description:

During SQL formatting, it was discovered that the newline character was missing after a single-line comment (-- comment). This causes the formatted SQL to be incorrect .

Test:

CREATE TRIGGER before_employee_delete
BEFORE DELETE ON employees
FOR EACH ROW
BEGIN
    -- abcd
    IF EXISTS (SELECT 1 FROM orders WHERE employee_id = OLD.id) THEN
        SIGNAL SQLSTATE '45000'
        SET MESSAGE_TEXT = 'Cannot delete employee because they have related orders';
    END IF;
END;

Formatted Result Before the Fix:

Formatted Result After the Fix:

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and can be relicensed under the terms of the LGPL v2.1 license in the future at the maintainers' discretion.
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[gavinking]

Looks reasonable.

[openai0229]

Looks reasonable.

Do I need to add more test cases?