As of now we show the same message to Manager/CPs which we show to customers when their project plan is not ready (i.e. there is no phase in the plan with planned and above status). Till now, it worked because we never had empty project plan for Managers/CPs, however, now we do have empty project plans after fixing #3097, so we need a better message to communicate the Manager/CP.
Here is what we show to the customers (and unintentionally to the Managers/CPs):

fyi @maxceem @RishiRajSahu