Throwing errors for comments and likes after latest changes

Problem/Motivation

Follow-up to #2724233: Block completly broken after instagram update.

From #2724233-16: Block completly broken after instagram update.

Notice: Undefined property: stdClass::$data in InstagramPost->__construct() (line 250 of /instagram_block.lib.php).
Warning: Invalid argument supplied for foreach() in InstagramPost->get_likes() (line 273 of /instagram_block.lib.php).
Notice: Undefined property: stdClass::$data in InstagramPost->__construct() (line 250 of /instagram_block.lib.php).
Warning: Invalid argument supplied for foreach() in InstagramPost->get_likes() (line 273 of /instagram_block.lib.php).

Proposed resolution

#2724233-28: Block completly broken after instagram update.

-    if ($instagram_post->comments->count) {
+    if ($instagram_post->comments->count && !empty($instagram_post->comments->data)) {
       $this->comment_count = $instagram_post->comments->count;
       $this->comments = $this->get_comments($instagram_post->comments->data);
     }
 
-    if ($instagram_post->likes->count) {
+    if ($instagram_post->likes->count && !empty($instagram_post->likes->data)) {
       $this->like_count = $instagram_post->likes->count;
       $this->likes = $this->get_likes($instagram_post->likes->data);
     }

Remaining tasks