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The application can be configured for different layouts using theme variables, for example, in the theme-settings.xml file of the corresponding theme.
A `tl:ThemeImage` can be added using the `<ICON>` tag. It is possible to configure an icon theme variable "without a value" using the value `none`: {{{#!xml <icon name="foo"
value="none"
/> }}} This means that the variable for the `tl:ThemeImage` exists, but no image is associated with it.
When this variable is resolved, the user should receive a `tl:ThemeImage$NoIcon`. However, this does not work. For the value `none`, it searches for an image named "/none" in the current context—for example, under "demo/none" in the demo application.
Application
In #26952, a theme variable is used to display an icon in the breadcrumb. Initially, no image should be displayed. However, the theme itself should allow for the option to assign an image for this purpose. To enable the user to customize the image in the theme editor, this variable must exist.
Test
Set an icon theme variable to "none" and inspect the image using the browser console. An <IMG src="demo/none"/> tag should no longer be rendered.