feat：优化项目信息

app/api/website/controller/sys/banner.go

@@ -24,6 +24,8 @@ func (c *Banner) Instance(key string) (*BannerInfo, error) {
 		"key": key, "local": key,
 	}); err != nil {
 		return nil, err
+	} else if mSysBanner.ID <= 0 {
+		return nil, nil
 	}
 	return &BannerInfo{
 		ID:         mSysBanner.GetEncodeID(),