Fixed NPE in RSSImageLinkTag, which erroneously assumes that RSSGenerator is always available. However, it might not be if RSS feeds are disabled.
Fixed NPE in RSSImageLinkTag, which erroneously assumes that RSSGenerator is always available. However, it might not be if RSS feeds are disabled.

git-svn-id: 6c0206e3b9edd104850923da33ebd73b435d374d@683491 13f79535-47bb-0310-9956-ffa450edef68

tateshitah/jspwiki,tateshitah/jspwiki,tateshitah/jspwiki,tateshitah/jspwiki