[enrich] Avoid "-- UNDEFINED --" values

Avoid `-- UNIDEFINED --` values for all SortingHat fields when
Mordred loses connection to the SortingHat server during the
enrichment or autorefresh execution. It will keep the values
​of the `name`, `email`, `id` and `uuid` fields.

Signed-off-by: Quan Zhou <quan@bitergia.com>

grimoire_elk/enriched/enrich.py

@@ -826,13 +826,16 @@ def get_sh_item_from_identity_cache(self, identity_tuple, backend_name):
                                          email=iden['email'],
                                          name=iden['name'],
                                          username=iden['username'])
+        iden['uuid'] = identity_id
+        iden['id'] = identity_id
+        iden['enrollments'] = []
 
         try:
             individual = self.get_entity(identity_id)
             if not individual:
                 msg = "Individual not found given the following identity: {}".format(identity_id)
                 logger.debug(msg)
-                return sh_item
+                return iden
 
             for indv_identity in individual['identities']:
                 if indv_identity['uuid'] == identity_id:
@@ -1054,7 +1057,6 @@ def get_item_sh(self, item, roles=None, date_field=None):
                     sh_fields = self.get_item_sh_fields(identity, item_date, rol=rol)
                 else:
                     sh_fields = self.get_item_no_sh_fields(identity, rol)
-
                 eitem_sh.update(sh_fields)
 
                 if not eitem_sh[rol + '_org_name']:

releases/unreleased/avoid-'---undefined---'-values.yml

@@ -0,0 +1,10 @@
+---
+title: Avoid '-- UNDEFINED --' values
+category: fixed
+author: Quan Zhou <quan@bitergia.com>
+issue: null
+notes: >
+    Avoid `-- UNIDEFINED --` values for all SortingHat fields when
+    Mordred loses connection to the SortingHat server during the
+    enrichment or autorefresh execution. It will keep the values
+    ​of the `name`, `email`, `id` and `uuid` fields.