Avoid empty web_links element inside of RevisionInfo
Web UI always requests WEB_LINKS from /changes/{id}, but the common
case for a server is to have no special PatchSetWebLink.
Skip the "web_links = []" JSON code that appears in every revision on
the change by setting the list to null.
Skip pointless copying of the computed collection by changing the
return type from WebLinks to clearly be a List<WebLinkInfo>, like
RevisionInfo expects. This allows direct assignment into the result.
Change-Id: I665e225b5abdd571a0adba8d2a1d318a1926801a
2 files changed
