PHRAS-2808-2806_disable-cterms_mask-writable-fields_4.1

fix php syntax error during circleci test (ok on devjy ?)
todo : implement "gui_editable" in edit ux (hide field when =false)
todo : 2 new strings (ckbox labels) to trans

lib/Alchemy/Phrasea/SearchEngine/Elastic/Indexer/Record/Hydrator/ThesaurusHydrator.php

@@ -98,7 +98,8 @@ class ThesaurusHydrator implements HydratorInterface
                 }
             }
             else {
-                if(($fields[$name])->get_generate_cterms()) {
+                $field = $fields[$name];
+                if($field->get_generate_cterms()) {
                     $this->candidate_terms->insert($field_names[$offset], $values[$offset]);
                 }
             }