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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0) Gecko/20020529

Description of problem:
after downloading files the back button is still enabled

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


How reproducible:
Always

Steps to Reproduce:
1. set up up2date to just download files
2. run up2date
3. select some packages
4. let it download the packages
5. after the packages have been downloaded, rather than clicking next, click back
(back should not be enabled at this time but it is) 
6. go back to the package selection screen
7. select nothing
8. click on next it will try to resolve dependancies
..........fails.............

Actual Results:  Traceback (innermost last):
  File "/usr/lib/python1.5/site-packages/libglade.py", line 28, in __call__
    ret = apply(self.func, a)
  File "/usr/share/rhn/up2date_client/gui.py", line 577, in onPackagePageNext
    self.__refreshCallback)
  File "/usr/share/rhn/up2date_client/up2date.py", line 2187, in dryRun
    if len(rc):
TypeError: len() of unsized object


Expected Results:  back button should not be enables

Additional info: