Avoid warning in network admin.

I may be missing something here, but It seems to me that, for multisite installations, when the plugin is network activated (or activated in the main site), the warning should not be displayed in network admin, since there are no configuration options there, but only in individual sites. I know the warning is referring to the configuration being missed in the main site, but I'm not quite sure if the network admin should be constantly noticed of missing things in the individual site's dashboard.