Description of problem:

Pushing "Make Default Printer" button in "Settings" tab of
configurator resulted in:

Traceback (most recent call last):
  File "/usr/share/system-config-printer/system-config-printer.py", line 1080,
in on_btnPMakeDefault_clicked
    if e != cups.HTTP_NOT_FOUND:
UnboundLocalError: local variable 'e' referenced before assignment

This was consistent in subsequent tries until exit.

That printer is a network located printer using built-in JetDirect server,
and Samsung ML-2250 pxlmono driver.

The queue in question is currently the only one so this happens
to be not a big issue in this configuration.  Morever it appears
that the operation actually succeeded because I see in printers.conf
"DefaultPrinter" tag and after a restart "State" says: "This is
the default printer" (but this is the only one).

Version-Release number of selected component (if applicable):
system-config-printer-0.7.50-1.fc7

How reproducible:
see above