Comment 0 for bug 999486

Software Center 5.2.1, Ubuntu 10.04

When testing the fix for a similar crash in bug 920196, I found that even with that fix I was able to cause a crash by repeatedly clicking the "All Software" button while Software Center is starting up.

The stacktrace is shown below.

TEST CASE:
1. open stock software-center
2. click on the "All Software" button very quickly while the main page is still loading
3. verify that there is a traceback (note that this does not happen always, just most of the time)
4. use the fixed version from -proposed
5. verify that (2) no longer produces the following (or any) traceback

Traceback (most recent call last):
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/db/enquire.py", line 115, in _get_estimate_nr_apps_and_nr_pkgs
    tmp_matches = enquire.get_mset(0, len(self.db), None, xfilter)
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/db/appfilter.py", line 89, in __call__
    if (not pkgname in self.cache and
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/db/pkginfo_impl/aptcache.py", line 263, in __contains__
    return self._cache.__contains__(k)
AttributeError: 'NoneType' object has no attribute '__contains__'
Traceback (most recent call last):
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/ui/gtk3/panes/viewswitcher.py", line 149, in config_view
    pane = vm.set_active_view(view_id)
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/ui/gtk3/session/viewmanager.py", line 149, in set_active_view
    view_widget.init_view()
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/ui/gtk3/panes/availablepane.py", line 168, in init_view
    self.apps_filter)
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/ui/gtk3/views/catview_gtk.py", line 240, in __init__
    self.build(desktopdir)
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/ui/gtk3/views/catview_gtk.py", line 492, in build
    self._build_homepage_view()
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/ui/gtk3/views/catview_gtk.py", line 267, in _build_homepage_view
    self._append_top_rated()
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/ui/gtk3/views/catview_gtk.py", line 404, in _append_top_rated
    top_rated_cat = self._update_top_rated_content()
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/ui/gtk3/views/catview_gtk.py", line 391, in _update_top_rated_content
    docs = top_rated_cat.get_documents(self.db)
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/db/categories.py", line 124, in get_documents
    nonblocking_load=False)
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/db/enquire.py", line 317, in set_query
    self._blocking_perform_search()
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/db/enquire.py", line 212, in _blocking_perform_search
    matches = enquire.get_mset(0, self.limit, None, xfilter)
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/db/appfilter.py", line 89, in __call__
    if (not pkgname in self.cache and
  File "/home/tremolux/Projects/precise/software-center_fix_crash_lp920196/5.2/softwarecenter/db/pkginfo_impl/aptcache.py", line 263, in __contains__
    return self._cache.__contains__(k)
AttributeError: 'NoneType' object has no attribute '__contains__'