fix/various fixes

api/tests/test_memoir_image_schema.py

@@ -32,6 +32,31 @@ class MemoirImageSchemaTest(unittest.TestCase):
 
         self.assertIsNone(asset)
 
+    def test_normalize_image_asset_completed_without_inline_placeholder(self):
+        asset = normalize_image_asset(
+            {
+                "index": 0,
+                "placeholder": "",
+                "description": "章节封面",
+                "status": "completed",
+                "url": "https://cos.example.com/cover.png",
+            }
+        )
+        self.assertIsNotNone(asset)
+        self.assertEqual(asset["placeholder"], "")
+        self.assertEqual(asset["description"], "章节封面")
+
+    def test_normalize_image_asset_completed_defaults_description(self):
+        asset = normalize_image_asset(
+            {
+                "status": "completed",
+                "url": "https://cos.example.com/x.png",
+            }
+        )
+        self.assertIsNotNone(asset)
+        self.assertEqual(asset["placeholder"], "")
+        self.assertEqual(asset["description"], "插图")
+
     def test_normalize_image_asset_preserves_retryable_for_failed_assets(self):
         asset = normalize_image_asset(
             {