Delay index generation message until toggle tag is triggered

scripts/api.py

@@ -373,12 +373,7 @@ def infinite_image_browsing_api(_: Any, app: FastAPI, **kwargs):
         img = DbImg.get(conn, path)
         if not img:
             if DbImg.count(conn) == 0:
-                raise HTTPException(
-                    400,
-                    "你需要先通过图像搜索页生成索引"
-                    if locale == "zh"
-                    else "You need to generate an index through the image search page first.",
-                )
+                return []
             update_image_data([os.path.dirname(path)])
             img = DbImg.get(conn, path)
         assert img
@@ -401,6 +396,13 @@ def infinite_image_browsing_api(_: Any, app: FastAPI, **kwargs):
                 else "Tag toggleing is not supported outside the Stable Diffusion webui folder. Please open an issue if you have any questions.",
             )
         img = DbImg.get(conn, path)
+        if not img:
+            raise HTTPException(
+                400,
+                "你需要先通过图像搜索页生成索引"
+                if locale == "zh"
+                else "You need to generate an index through the image search page first.",
+            )
         tags = ImageTag.get_tags_for_image(
             conn=conn, image_id=img.id, type="custom", tag_id=req.tag_id
         )