I am no RPM pro, so I am not sure what is where in CentOS 7.
libappindicator is used to show the tray icon on the user desktop. If you do not plan on using the desktop, you can ignore it. If you do not install it, it should work anyway, using the GTK app indicator, which may or may not be hidden by default.
I can see that some versions of Fedora has the package: