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[David Moreau Simard <dms@xxxxxxxxxx>]

Public bug reported:

We started seeing build failures in packaging Horizon for RDO recently
and the problems seem to correlate around
https://review.openstack.org/#/c/400794/ which causes the following
stack trace:

====
DEBUG: + /usr/bin/python manage.py collectstatic --noinput --clear
DEBUG: Traceback (most recent call last):
DEBUG:   File "manage.py", line 23, in <module>
DEBUG:     execute_from_command_line(sys.argv)
DEBUG:   File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 354, in execute_from_command_line
DEBUG:     utility.execute()
DEBUG:   File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 303, in execute
DEBUG:     settings.INSTALLED_APPS
DEBUG:   File "/usr/lib/python2.7/site-packages/django/conf/__init__.py", line 48, in __getattr__
DEBUG:     self._setup(name)
DEBUG:   File "/usr/lib/python2.7/site-packages/django/conf/__init__.py", line 44, in _setup
DEBUG:     self._wrapped = Settings(settings_module)
DEBUG:   File "/usr/lib/python2.7/site-packages/django/conf/__init__.py", line 92, in __init__
DEBUG:     mod = importlib.import_module(self.SETTINGS_MODULE)
DEBUG:   File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module
DEBUG:     __import__(name)
DEBUG:   File "/builddir/build/BUILD/horizon-11.0.0.0rc2.dev1/openstack_dashboard/settings.py", line 410, in <module>
DEBUG:     XSTATIC_MODULES, HORIZON_CONFIG)
DEBUG:   File "/builddir/build/BUILD/horizon-11.0.0.0rc2.dev1/openstack_dashboard/utils/settings.py", line 261, in get_xstatic_dirs
DEBUG:     for file in files:
DEBUG: TypeError: 'NoneType' object is not iterable
====

It looks as if the value should be an empty list (which is iterable)
rather than None.

** Affects: horizon
     Importance: Undecided
     Assignee: David Moreau Simard (dmsimard)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1662180

Title:
  manage.py collectstatic failing with 'NoneType' object is not iterable

Status in OpenStack Dashboard (Horizon):
  In Progress

Bug description:
  We started seeing build failures in packaging Horizon for RDO recently
  and the problems seem to correlate around
  https://review.openstack.org/#/c/400794/ which causes the following
  stack trace:

  ====
  DEBUG: + /usr/bin/python manage.py collectstatic --noinput --clear
  DEBUG: Traceback (most recent call last):
  DEBUG:   File "manage.py", line 23, in <module>
  DEBUG:     execute_from_command_line(sys.argv)
  DEBUG:   File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 354, in execute_from_command_line
  DEBUG:     utility.execute()
  DEBUG:   File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 303, in execute
  DEBUG:     settings.INSTALLED_APPS
  DEBUG:   File "/usr/lib/python2.7/site-packages/django/conf/__init__.py", line 48, in __getattr__
  DEBUG:     self._setup(name)
  DEBUG:   File "/usr/lib/python2.7/site-packages/django/conf/__init__.py", line 44, in _setup
  DEBUG:     self._wrapped = Settings(settings_module)
  DEBUG:   File "/usr/lib/python2.7/site-packages/django/conf/__init__.py", line 92, in __init__
  DEBUG:     mod = importlib.import_module(self.SETTINGS_MODULE)
  DEBUG:   File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module
  DEBUG:     __import__(name)
  DEBUG:   File "/builddir/build/BUILD/horizon-11.0.0.0rc2.dev1/openstack_dashboard/settings.py", line 410, in <module>
  DEBUG:     XSTATIC_MODULES, HORIZON_CONFIG)
  DEBUG:   File "/builddir/build/BUILD/horizon-11.0.0.0rc2.dev1/openstack_dashboard/utils/settings.py", line 261, in get_xstatic_dirs
  DEBUG:     for file in files:
  DEBUG: TypeError: 'NoneType' object is not iterable
  ====

  It looks as if the value should be an empty list (which is iterable)
  rather than None.

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