DDMsgReader: For indexed mode newscan, default to showing "No new messages" instead of showing the indexed menu if there are no new messages. This can be toggled via a user setting & new configuration option, displayIndexedModeMenuIfNoNewMessages

DDMsgReader Indexed newscan: By default, if there are no new messages, it now shows "No new messages." (578 QWKNoNewMessages from text.dat). There's a new user setting to toggle whether to use the indexed newscan menu even if there are no new messages. New configuration file option: displayIndexedModeMenuIfNoNewMessages, which is a default for a user setting to toggle whether or not to use the Indexed newscan menu even when there are no new messages.