<< Is there some script (or a command like N that shows empty planes) to spot these problems?

script: /* Show edges no complet */ var gd = moi.geometryDatabase; gd.deselectAll(); var breps =gd.getObjects().getBreps(); for ( var i = 0; i < breps.length; ++i ) breps.item(i).getNakedEdges().setProperty( 'selected', true );