Silencing of TypeErrors during value retrieval

[dferens]

Hi,

At my company we've run into issues when TypeError exceptions were silenced inside django-elasticsearch-dsl.

When ES field is targeting model's @property and TypeError is raised within getter, it will be completely hidden as int(attr) will raise ValueError and None will be returned:

django-elasticsearch-dsl/django_elasticsearch_dsl/fields.py

Lines 64 to 80 in f6fa886

	try:
	instance = getattr(instance, attr)
	except ObjectDoesNotExist:
	return None
	except (TypeError, AttributeError):
	try:
	instance = instance[int(attr)]
	except (
	IndexError, ValueError,
	KeyError, TypeError
	):
	if self._required:
	raise VariableLookupError(
	"Failed lookup for key [{}] in "
	"{!r}".format(attr, instance)
	)
	return None

We need to remove that TypeError from except clause and figure out an alternative solution. At my company, we've been struggling with this for a while so I can prepare a PR if you agree on this.

Thanks!