Skip empty dataframes when creating addplots

[fxhuhn]

I add signals to my diagram using make_addplot. But if there are no signals in the selected time period, I get an error.

I have solved it for me as follows:

            if stock[stock['Signal'].notnull()].shape[0] == 0:
                print ("- no Signal")
            else:
                signal_short = mpf.make_addplot(stock['Signal'] * 0.93,
                                                scatter=True,
                                                markersize=150,
                                                marker='v',
                                                color='red'
                                                )
                add_plots.append(signal_short)

Would it not be an option to integrate this directly into the function and, if necessary, only issue a warning?

    if data.notnull()].shape[0] == 0:
        raise Warning("Empty Dataframe!")