feat(rss): relax <author> tag output condition to allow name-only

[huanjuedadehen]

Background

Previously, the <author> tag in the generated RSS 2.0 feed was only included when both the author's name and email were provided. However, in many real-world cases, authors may choose not to provide an email address. In such situations, displaying the author's name alone can still be useful for attribution and clarity.

Changes

• Adjusted the logic to output the <author> tag when the author's name exists, regardless of whether the email is present.
• This improves flexibility and ensures that author information is not omitted unnecessarily.

Impact

• Backward compatible change.
• No effect on existing behavior when both name and email are present.
• Adds support for generating <author> tag with name only.