ansible filter module -- arrayitize

ansible-playbook.log

Traceback (most recent call last):
  File "/opt/ansible-git/bin/ansible-playbook", line 324, in <module>
    sys.exit(main(sys.argv[1:]))  
  File "/opt/ansible-git/bin/ansible-playbook", line 264, in main
    pb.run()
  File "/opt/ansible-git/lib/ansible/playbook/__init__.py", line 310, in run
    play = Play(self, play_ds, play_basedir, vault_password=self.vault_password)
  File "/opt/ansible-git/lib/ansible/playbook/play.py", line 124, in __init__
    ds = template(basedir, ds, temp_vars)
  File "/opt/ansible-git/lib/ansible/utils/template.py", line 146, in template
    d[k] = template(basedir, v, templatevars, lookup_fatal, depth, expand_lists, convert_bare, fail_on_undefined, filter_fatal)
  File "/opt/ansible-git/lib/ansible/utils/template.py", line 146, in template
    d[k] = template(basedir, v, templatevars, lookup_fatal, depth, expand_lists, convert_bare, fail_on_undefined, filter_fatal)
  File "/opt/ansible-git/lib/ansible/utils/template.py", line 127, in template
    varname = template_from_string(basedir, varname, templatevars, fail_on_undefined)
  File "/opt/ansible-git/lib/ansible/utils/template.py", line 353, in template_from_string
    environment.filters.update(_get_filters())
  File "/opt/ansible-git/lib/ansible/utils/template.py", line 53, in _get_filters
    plugins = [ x for x in utils.plugins.filter_loader.all()]
  File "/opt/ansible-git/lib/ansible/utils/plugins.py", line 233, in all
    yield getattr(self._module_cache[path], self.class_name)(*args, **kwargs)
TypeError: FilterModule() takes exactly 1 argument (0 given)

arrayitize.py

def arrayitize(*a, **kw):
    ''' Place passed in arguments into an array '''
    if len(a) is 1:
        if  type(a[0]) is list:
            return a
        elif a[0] is None:
            return []
    val = []
    for el in a:
        val.append(el)
    return val

def FilterModule(object):
    ''' Compfuzor jinja2 filters '''

    def filters(self):
        return {
            'arrayitize': arrayitize
        }