** Branch linked: lp:software-center/5.2

** Branch linked: lp:software-center

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https://bugs.launchpad.net/bugs/994341

Title:
  Crash when clicking on "installed" too early

Status in “software-center” package in Ubuntu:
  Fix Released
Status in “software-center” source package in Precise:
  Fix Committed
Status in “software-center” source package in Quantal:
  Fix Released

Bug description:
  From errors.ubuntu.com:

  If you click on "installed" while software-center is initializing (and
  the apt cache is not ready) it crashes with:

  2012-05-03 18:01:16,188 - softwarecenter.db.enquire - ERROR - 
_get_estimate_nr_apps_and_nr_pkgs failed
  Traceback (most recent call last):
    File 
"/scratch/egon/devel/software-center/trunk/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 
"/scratch/egon/devel/software-center/trunk/softwarecenter/db/appfilter.py", 
line 94, in __call__
      if (not pkgname in self.cache or
    File 
"/scratch/egon/devel/software-center/trunk/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 
"/scratch/egon/devel/software-center/trunk/softwarecenter/ui/gtk3/panes/installedpane.py",
 line 374, in profiled_rebuild_categorised_view
      rebuild_categorised_view()
    File 
"/scratch/egon/devel/software-center/trunk/softwarecenter/ui/gtk3/panes/installedpane.py",
 line 401, in rebuild_categorised_view
      persistent_duplicate_filter=(i > 0))
    File 
"/scratch/egon/devel/software-center/trunk/softwarecenter/db/enquire.py", line 
317, in set_query
      self._blocking_perform_search()
    File 
"/scratch/egon/devel/software-center/trunk/softwarecenter/db/enquire.py", line 
212, in _blocking_perform_search
      matches = enquire.get_mset(0, self.limit, None, xfilter)
    File 
"/scratch/egon/devel/software-center/trunk/softwarecenter/db/appfilter.py", 
line 94, in __call__
      if (not pkgname in self.cache or
    File 
"/scratch/egon/devel/software-center/trunk/softwarecenter/db/pkginfo_impl/aptcache.py",
 line 263, in __contains__
      return self._cache.__contains__(k)
  AttributeError: 'NoneType' object has no attribute '__contains__'

  Its often reported error so we need to fix it.

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