Please hide the indicator-messages icon if there's no messages to show

[shankao]

Current situation:
When there are no messages to show, the indicator menu only shows the list of apps that can currently publish messages.
Clicking on any app name opens the app in a browser instance.

Suggestion:
Only show the indicator in the case of pending messages; hide it otherwise, decluttering a bit the indicators area.
The only use case is the links to the apps. I'd say that, at the moment they only serve as app shortcuts that can't be removed: if so, they should live better in unity panel instead, where they can be removed or pinned in a more flexible way.
If the links serve as a shortcut to each specific user's account, then they should be moved to the "online accounts" section of the System Settings (if they are not there already, they should be)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: indicator-messages 13.10.1+15.10.20150505-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-4.19-generic 4.4.1
Uname: Linux 4.4.0-4-generic x86_64
ApportVersion: 2.19.4-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Feb 13 15:27:15 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-11-25 (1175 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120627)
ProcEnviron:
 LANGUAGE=en_SG:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_SG.UTF-8
 SHELL=/bin/bash
SourcePackage: indicator-messages
UpgradeStatus: Upgraded to xenial on 2015-03-14 (335 days ago)

[Sebastien Bacher (seb128)]

Thank you for your suggestions, note that the indicator is also useful when there is no message, it let you
- change your online status (when using some IM clients)
- do action like compose a new email
- start the softwares/focus them when needed