Add basic checks for valid My Subscription request data

- TODO: Rewrite YouTube.get_my_subscriptions with better error and thread handling

resources/lib/youtube_plugin/youtube/client/youtube.py

@@ -1298,7 +1298,7 @@ def _perform(_page_token, _offset, _result):
 
             # if new uploads is cached
             cache_items_key = 'my-subscriptions-items'
-            cached = cache.get_item(cache_items_key, cache.ONE_HOUR)
+            cached = cache.get_item(cache_items_key, cache.ONE_HOUR) or []
             if cached:
                 _result['items'] = cached
 
@@ -1398,7 +1398,7 @@ def fetch_xml(_url, _responses):
                 # sorting by publish date
                 def _sort_by_date_time(item):
                     return datetime_parser.since_epoch(
-                        datetime_parser.strptime(item['published'][0:19])
+                        datetime_parser.strptime(item['published'])
                     )
 
                 _result['items'].sort(reverse=True, key=_sort_by_date_time)

resources/lib/youtube_plugin/youtube/helper/yt_specials.py

@@ -171,7 +171,7 @@ def _extract_urls(video_id):
         ) as progress_dialog:
             resource_manager = provider.get_resource_manager(context)
 
-            video_data = resource_manager.get_videos((video_id, ))
+            video_data = resource_manager.get_videos((video_id,))
             yt_item = video_data[video_id]
             if not yt_item or 'snippet' not in yt_item:
                 context.get_ui().on_ok(
@@ -286,32 +286,25 @@ def _process_saved_playlists_tv(provider, context):
         offset=context.get_param('offset', 0)
     )
 
+    if not json_data:
+        return False
     return tv.saved_playlists_to_items(provider, context, json_data)
 
 
-def _process_new_uploaded_videos_tv(provider, context):
-    context.set_content(content.VIDEO_CONTENT)
-
-    json_data = provider.get_client(context).get_my_subscriptions(
-        page_token=context.get_param('next_page_token', ''),
-        offset=context.get_param('offset', 0)
-    )
-
-    return tv.my_subscriptions_to_items(provider, context, json_data)
-
-
-def _process_new_uploaded_videos_tv_filtered(provider, context):
+def _process_new_uploaded_videos_tv(provider, context, filtered=False):
     context.set_content(content.VIDEO_CONTENT)
 
     json_data = provider.get_client(context).get_my_subscriptions(
         page_token=context.get_param('next_page_token', ''),
         offset=context.get_param('offset', 0)
     )
 
+    if not json_data:
+        return False
     return tv.my_subscriptions_to_items(provider,
                                         context,
                                         json_data,
-                                        do_filter=True)
+                                        do_filter=filtered)
 
 
 def process(category, provider, context):
@@ -333,7 +326,7 @@ def process(category, provider, context):
     if category == 'new_uploaded_videos_tv':
         return _process_new_uploaded_videos_tv(provider, context)
     if category == 'new_uploaded_videos_tv_filtered':
-        return _process_new_uploaded_videos_tv_filtered(provider, context)
+        return _process_new_uploaded_videos_tv(provider, context, filtered=True)
     if category == 'disliked_videos':
         return _process_disliked_videos(provider, context)
     if category == 'live':