Description of problem:
Attempt to install using updates image from https://bugzilla.redhat.com/show_bug.cgi?id=860677

Version-Release number of selected component:
anaconda-18.29.2

Additional info:
libreport version: 2.0.17
cmdline:        /usr/bin/python  /sbin/anaconda
kernel:         3.6.6-3.fc18.x86_64

description:
:The following was filed automatically by anaconda:
:anaconda 18.29.2 exception report
:Traceback (most recent call first):
:  File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module
:    __import__(name)
:  File "/tmp/updates/pyanaconda/ui/common.py", line 404, in collect
:    module = importlib.import_module(module_pattern % mod_name)
:  File "/tmp/updates/pyanaconda/ui/__init__.py", line 121, in getActionClasses
:    standalones = collect(module_pattern, path, lambda obj: issubclass(obj, standalone_class) and \
:  File "/tmp/updates/pyanaconda/ui/gui/__init__.py", line 66, in setup
:    actionClasses = self.getActionClasses("pyanaconda.ui.gui.spokes.%s", path, self._hubs, StandaloneSpoke)
:  File "/sbin/anaconda", line 991, in <module>
:    anaconda._intf.setup(ksdata)
:  File "/tmp/updates/pyanaconda/ui/gui/spokes/custom.py", line 1757
:    self.window.show_all()
:       ^
:SyntaxError: invalid syntax