Index: Keywords/rmempty.ucl
===================================================================
--- /dev/null
+++ Keywords/rmempty.ucl
@@ -0,0 +1,13 @@
+# $FreeBSD: head/Keywords/rmtry.ucl 533339 2020-04-29 14:33:55Z bapt $
+#
+# MAINTAINER:	portmgr@FreeBSD.org
+actions: []
+pre-deinstall-lua: <<EOD
+	file = pkg.prefixed_path("%@")
+	f = io.open(file, "r")
+	size = f:seek("end")
+	io.close(f)
+	if size == 0 then
+	  os.remove(file)
+	end
+EOD