Checking for $user->urlid before trying to access it (bug #1253462)

In some cases the $user->urlid may not be present - this checks for it
before accessing it otherwise it falls back to the $id to get info

Change-Id: I989e68321402f458b167879e994150213c3e4893
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>

htdocs/lib/user.php

@@ -1609,7 +1609,8 @@ function profile_url($user, $full=true, $useid=false) {
     }
     else if (is_numeric($user)) {
         $id = $user;
-        $urlid = $wantclean ? get_user_for_display($id)->urlid : null;
+        $user = get_user_for_display($id);
+        $urlid = ($wantclean && !empty($user->urlid)) ? $user->urlid : null;
     }
     else if (isset($user->id)) {
         $id = $user->id;