Sure: no.

But I'm sure `pdf_url` is not used (even if also defined in a similar form in [geonetwork submodule](https://github.com/georchestra/geonetwork/blob/georchestra-13.12/web/src/main/filters/maven.filter#L29) - see also this [ticket](https://github.com/georchestra/geonetwork/issues/13)).

pdfurl is used in two places:

* [extractorapp](https://github.com/georchestra/template/blob/master/extractorapp/app/js/GEOR_custom.js#L33), ie in https://github.com/georchestra/georchestra/blob/master/extractorapp/src/main/webapp/app/js/GEOR_dlform.js#L131
* [geonetwork](https://github.com/georchestra/template/blob/master/geonetwork-client/apps/georchestra/js/Settings.js#L96), ie in https://github.com/georchestra/geonetwork/blob/renamestatic/web-client/src/main/resources/apps/georchestra/js/downloadForm.js#L118

In both cases, empty string is managed correctly.