However, you can set a nr. of messages there - but not that "no data to display"_message.
I think I'll try to tackle that in a different way, though, by simply manipulating the base file so that it has the value 0 in those months where there is no data yet - so I won't get that message to begin with.
That worked fine. Now my standard_selections work for that diagram, too - albeit there's nothing to see, there are 0 whatchamacallits in the list for the current month - but at least there is no error message.
I understand quite well, I've seen that option and tried it out. The message of "no data to display" isn't there. I could do it otherwise, of course: I could set a condition for the formulas depending on the month_selection and then edit the message of "all formulas deactivated". Several roads lead to Rome...