Hi, Despite not being documented the *getLegendGraphic* request allows for a *transparent* option (see source code <https://github.com/geoserver/geoserver/blob/master/src/wms/src/main/java/org/geoserver/wms/GetLegendGraphicRequest.java#L42>) allowing for a transparent background legend (*image/png format*).
I was combining the *transparent* option with the *hideEmptyRules *option, but in cases when there *are no features matching any rule* geoserver just throws an error: *java.lang.IllegalArgumentException: Width (2) and height (0) must be > 0* Removing the transparent option successfully returns a empty white background image. is this the desired behaviour?
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