I started an ISO upload, let it go for a bit, and then stopped it with ctrl-c. Then I tried to start the upload again and got the message telling me to look in admin.log. This was what I found in there:

I can't attach the ISO to this ticket since it's huge, but any large file will do (just needs to be large enough for you to have an opportunity to stop it before it finishes.) The file you test with doesn't even have to be an ISO.

This should reproduce:

$ pulp-admin iso repo create --repo-id uploads

$ pulp-admin iso repo uploads upload --repo-id uploads -f ~/Desktop/Fedora-17-x86_64-Live-Desktop.iso

(Stop the upload while it is still going.)

$ pulp-admin iso repo uploads resume
+----------------------------------------------------------------------+
                            Upload Requests
+----------------------------------------------------------------------+

An unexpected error has occurred. More information can be found in the client
log file ~/.pulp/admin.log.

$ tail -n 13 ~/.pulp/admin.log 
2013-06-06 10:14:55,101 - ERROR - Client-side exception occurred
Traceback (most recent call last):
  File "/home/rbarlow/devel/pulp/platform/src/pulp/client/extensions/core.py", line 478, in run
    exit_code = Cli.run(self, args)
  File "/usr/lib/python2.7/site-packages/okaara/cli.py", line 974, in run
    exit_code = command_or_section.execute(self.prompt, remaining_args)
  File "/home/rbarlow/devel/pulp/platform/src/pulp/client/extensions/extensions.py", line 224, in execute
    return self.method(*arg_list, **clean_kwargs)
  File "/home/rbarlow/devel/pulp/platform/src/pulp/client/commands/repo/upload.py", line 398, in run
    source_filenames = [os.path.basename(u.source_filename) for u in non_running_uploads]
  File "/usr/lib64/python2.7/posixpath.py", line 112, in basename
    i = p.rfind('/') + 1
AttributeError: 'NoneType' object has no attribute 'rfind'