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Null entry in a Graphics list?


Is there a "Null" or a "None" for Graphics?

If I want to accomplish something like

    g1 = Graphics[---];
    g2 = Graphics[---]
    g3 = If[test, Graphics[---], NoGraphics ];
    
    Show[g1, g2, g3 ];

is there something I can put in for "NoGraphics" (other than an 
offscreen Point or a zero-size Point or . . . ) that will be acceptable 
in subsequent graphics commands


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