Conut document have children that are show in navigation 

if(Documents[CurrentDocument.NodeAliasPath].Children.WithAllData.Where("ClassName = 'cms.menuitem' AND DocumentMenuItemHideInNavigation = 0").Count > 0) { true } else { false }
OR 
if(Documents[NodeAliasPath].Children.Where("ClassName = 'CMS.MenuItem' AND DocumentMenuItemHideInNavigation = 0").Count > 0) { true } else { false }

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