Merge pull request #24 from ganeshrn/element_fix

Fix element key error

Reviewed-by: Nilashish Chakraborty <nilashishchakraborty8@gmail.com>
             https://github.com/NilashishC

roles/resource_module/filter_plugins/to_argspec.py

@@ -24,7 +24,7 @@ def dive(obj, required=False):
             result['options'][propkey] = dive(propval, required)
     elif obj['type'] == 'array':
         result['options'] = {}
-        if obj['elements']:
+        if obj.get('elements'):
             result['elements'] = obj['elements']
         if not 'items' in obj:
             raise AnsibleFilterError('missing items key in array')