Description of problem:
Cloning a custom software channel results in not being able to manage the newly cloned channel via the WebUI.  The channel can be displayed, but when trying to manage the channel, the WebUI returns an "internal server error."  This manifests in not getting a confirmation page when cloning the channel as well as not being able to manage the channel in the "manage software channels" section of the WebUI.

Version-Release number of selected component (if applicable):
Spacewalk 0.6

How reproducible:
Infinitely

Steps to Reproduce:
1. Clone any custom software channel.
2. Upon completion of the clone process, the WebUI returns internal server error.
3. Additionally, attempting to manage the cloned channel via the WebUI results in an internal server error.
  
Actual results:
Internal server error returned from WebUI.

Expected results:
Manage channel page returned from WebUI.

Additional info:
This was discussed in the spacewalk-devel list with the following determination by Prad.

-----
So lookong through the code, I think I know what I problem is. The perl 
code when settup up the channel cloning process does'nt not account for 
checksum value. So what ends up happening is, after the perl pxt setup 
page it navigates to edit.do which makes assumptions based on channel 
creation and edits and ends up trying to set the value thats not in the 
form to being with. A workaround fix to get the cloning working for now 
is to do something like,

--- 
a/java/code/src/com/redhat/rhn/frontend/action/channel/manage/EditChannelAct
+++ 
b/java/code/src/com/redhat/rhn/frontend/action/channel/manage/EditChannelAct
@@ -568,7 +568,9 @@ public class EditChannelAction extends RhnAction 
implements
             form.set("maintainer_phone", c.getMaintainerPhone());
             form.set("maintainer_email", c.getMaintainerEmail());
             form.set("support_policy", c.getSupportPolicy());
-            form.set("checksum", c.getChecksum().getLabel());
+            if (!c.isCloned()) {
+                form.set("checksum", c.getChecksum().getLabel());
+            }
             if (c.isGloballySubscribable(ctx.getLoggedInUser().getOrg())) {
                 form.set("per_user_subscriptions", "all");
             }

eventually once the cloning logic in perl supports the checksum stuff, 
we can remove this additional check.

I'll looking into adding this ability for the cloned channels. Please 
open a bug on this and I'll knock it out asap.

Thanks,
~ Prad
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