ERP5Form: fix Form.proxifyField when field only has TALES

The internal data structures are made of two dicts: .values for values and
.tales for TALES. Formulator expect that these two dicts have keys for all
properties, because of the implementation of Field.has_value which checks
for the presence of the key in .values

When making a field with only TALES, this method was setting the value only
in .tales but the same key needs to be present also in .values, otherwise
get_value would return False for this key.

bt5/erp5_core_test/TestTemplateItem/portal_components/test.erp5.testProxify.py

@@ -134,6 +134,7 @@ class TestProxify(ERP5TypeTestCase):
     self.assertEqual(field.is_delegated('items'), False)
     self.assertEqual(field.get_tales('items')._text,
                      'here/portal_categories/region/getCategoryChildTranslatedLogicalPathItemList')
+    self.assertTrue(field.has_value('items'))
     self.assertEqual(field.is_delegated('enabled'), True)
     self.assertEqual(field.get_value('enabled'), 1)
     self.assertEqual(field.is_delegated('description'), True)

product/ERP5Form/Form.py

@@ -1184,13 +1184,14 @@ class ERP5Form(Base, ZMIForm, ZopePageTemplate):
                                         new_tales[i]):
                                 del new_tales[i]
 
-            delegated_list = []
-            for i in (new_values.keys()+new_tales.keys()):
-                if not i in delegated_list:
-                    delegated_list.append(i)
+            # make sure every TALES is also in values, this is required for has_value
+            for key in new_tales:
+                if key not in new_values:
+                    new_values[key] = proxy_field.get_recursive_orig_value(key, include=0)
+
             proxy_field.values.update(new_values)
             proxy_field.tales.update(new_tales)
-            proxy_field.delegated_list = sorted(delegated_list)
+            proxy_field.delegated_list = list(sorted(new_values.keys()))
 
             # move back to the original group and position.
             set_group_and_position(group, position, field_id)