gluon-web-admin: remove pubkey empty string workarround

Co-Authored-By: Matthias Schiffer <mschiffer@universe-factory.net>

package/gluon-web-admin/files/lib/gluon/config-mode/view/admin/info.html

@@ -18,10 +18,6 @@
 		if active_vpn ~= nil then
 			pubkey = active_vpn.public_key()
 		end
-
-		if pubkey == '' then
-			pubkey = nil
-		end
 	end
 
 	local values = {