fix: fix getting some properties in videoDetails

the endpoint changes from the previous commit also help with this fix

closes #800
closes #809

Author: fent

lib/info-extras.js

@@ -109,7 +109,7 @@ exports.getAuthor = info => {
   }
   try {
     let videoDetails = info.player_response.microformat && info.player_response.microformat.playerMicroformatRenderer;
-    let id = videoDetails ? videoDetails.channelId : channelId;
+    let id = (videoDetails && videoDetails.channelId) || channelId || info.player_response.videoDetails.channelId;
     let author = {
       id: id,
       name: videoDetails ? videoDetails.ownerChannelName : info.player_response.videoDetails.author,
@@ -121,7 +121,9 @@ exports.getAuthor = info => {
       verified,
       subscriber_count: subscriberCount,
     };
-    utils.deprecate(author, 'avatar', author.thumbnails[0].url, 'author.avatar', 'author.thumbnails[0].url');
+    if (thumbnails.length) {
+      utils.deprecate(author, 'avatar', author.thumbnails[0].url, 'author.avatar', 'author.thumbnails[0].url');
+    }
     return author;
   } catch (err) {
     return {};

test/info-test.js renamed to test/basic-info-test.js

@@ -146,13 +146,13 @@ declare module 'ytdl-core' {
       id: string;
       name: string;
       avatar: string; // to remove later
-      thumbnails: thumbnail[];
+      thumbnails?: thumbnail[];
       verified: boolean;
       user?: string;
       channel_url: string;
       external_channel_url?: string;
       user_url?: string;
-      subscriber_count: number;
+      subscriber_count?: number;
     }
 
     interface MicroformatRenderer {