Import the last 4 missing comments

web/modules/custom/agaric_migration/migrations/agaric_comment.yml

@@ -14,8 +14,8 @@ process:
       source: pid
       no_stub: true
     -
-      plugin: skip_on_empty
-      method: row
+      plugin: default_value
+      method: 0
   entity_id:
     -
       plugin: migration_lookup
@@ -43,8 +43,7 @@ process:
       no_stub: true
     -
       plugin: default_value
-      default_value: "0"
-      struct: true
+      default_value: 0
   name: name
   mail: mail
   homepage: homepage