family: always return a family to cell, even if empty or error

combo/apps/family/models.py

@@ -58,7 +58,7 @@ class FamilyInfosCell(CellBase):
                                          settings.FAMILY_SERVICE.get('signature_key'))
                 ws_family_data = requests.get(ws_family_url).json()
                 if ws_family_data.get('err') or not ws_family_data.get('data'):
-                    return {}
+                    return {'family': ws_family_data}
                 # get formdefs and formdata from wcs
                 def add_forms(obj, formdefs, forms, drafts, id_varname):
                     keywords_set = set(obj.get('keywords', []))