WebDAV PROPFIND on non-existent resources causes NPE

For an authenticated user, a PROPFIND request on a non-existent resource results in an NPE propagated to the WebDAV client.

The KDE kioslave for example issues a PROPFIND on a document that it is about to copy into a folder. The document probably doesn't yet exist on the server (as the user is copying it) and so an NPE is generated.

Presumably the server should respond with an HTTP 404

Caused by: java.lang.NullPointerException
at org.nuxeo.ecm.platform.webdav.mapping.DavPropertiesMapper.getDavProperties(DavPropertiesMapper.java:71)
at org.nuxeo.ecm.platform.webdav.servlet.NuxeoWebDavServlet.writeProperties(NuxeoWebDavServlet.java:166)
at org.nuxeo.ecm.platform.webdav.servlet.NuxeoWebDavServlet.doPropfind(NuxeoWebDavServlet.java:98)
at org.nuxeo.ecm.platform.webdav.servlet.ExtensibleWebdavServlet.service(ExtensibleWebdavServlet.java:60)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.nuxeo.wss.servlet.WSSFilter.doFilter(WSSFilter.java:135)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.nuxeo.ecm.platform.ui.web.rest.FancyURLFilter.doFilter(FancyURLFilter.java:127)