Creating a new group with cleanurls active, throws a warning

[Aaron Wells]

[WAR] b9 (group/edit.php:473) Undefined index: urlid
Call stack (most recent first):

    log_message("Undefined index: urlid", 8, true, true, "/var/www/columbia-dev-mahara/releases/201308120359...", 473) at /var/www/columbia-dev-mahara/releases/20130812035927/lib/errors.php:446
    error(8, "Undefined index: urlid", "/var/www/columbia-dev-mahara/releases/201308120359...", 473, array(size 6)) at /var/www/columbia-dev-mahara/releases/20130812035927/group/edit.php:473
    editgroup_submit(object(Pieform), array(size 26)) at Unknown:0
    call_user_func_array("editgroup_submit", array(size 2)) at /var/www/columbia-dev-mahara/releases/20130812035927/lib/pieforms/pieform.php:514
    Pieform->__construct(array(size 4)) at /var/www/columbia-dev-mahara/releases/20130812035927/lib/pieforms/pieform.php:161
    Pieform::process(array(size 4)) at /var/www/columbia-dev-mahara/releases/20130812035927/lib/pieforms/pieform.php:71
    pieform(array(size 4)) at /var/www/columbia-dev-mahara/releases/20130812035927/group/edit.php:390

[Aaron Wells (u-aaronw)]

https://reviews.mahara.org/2399

[Kristina Hoeppner (kris-hoeppner)]

This seems to be a regression. I had not encountered this problem before.

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/2399
Committed: http://gitorious.org/mahara/mahara/commit/7b3c69d192ae2762e97cd6f24ec594e3403d8408
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 7b3c69d192ae2762e97cd6f24ec594e3403d8408
Author: Aaron Wells <email address hidden>
Date: Mon Aug 12 17:33:11 2013 +1200

htdocs/group/edit.php: Squelch a cleanurls warning (bug 1211161)

- also bug 1212863

The code is designed to rely on the not set variable being automatically
converted to an empty string, but PHP throws a warning if you do that.

Change-Id: I40c2c7bd69939779bda68f4de4d47643f0212f42