Hide Blank series in a chart

Hello,
I need your help, I'm making drop-down lists on charts, so when I choose ALL in the list the chart shows information about 4 regions and the series' names are: Americas, EMEA,....
When I want to choose only one region in a list for instance Americas I could manage to hide the name of series but the colors and lines for it still remains, So my question is do you know any way to completely hide blank series and if I choose one region only I want to hide other region colors and series, so I could have only Americas.

Thank you
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