feat 添加没有获取到字幕的情况

subtitles/client.go

@@ -52,6 +52,9 @@ func (c *Client) GetSubtitles(url string) (string, error) {
 			break
 		}
 	}
+	if subTitlesUrl == "" {
+		return "", fmt.Errorf("没有找到字幕")
+	}
 	subtitles, err := c.callSubtitles(subTitlesUrl)
 	if err != nil {
 		return "", err
@@ -124,6 +127,8 @@ func parseBilibiliUrl(bu string) (vid string, page int, err error) {
 	if query.Get("p") != "" {
 		pageStr := query.Get("p")
 		page, _ = strconv.Atoi(pageStr)
+	} else {
+		page = 1
 	}
 	return vid, page, nil
 }