Fix Issue #1038 (#1043)

Author: @s1as3r 

* Fix Issue #1038

Fixes [Issue #1038](#1038)

- When searching for a song, spotdl gathers all the results that the youtube music api provides. 
- If one of the songs in the results is not available in a country, 'playNavigationEndpoint' key would not be present in it's result, hence this error.

* Update provider.py

Made Changes as suggested by @tytydraco

* Update provider.py

- Used `.get()` method instead of a try-except block.

spotdl/search/provider.py

@@ -172,14 +172,16 @@ def __query_and_simplify(searchTerm: str, apiKey: str = ytmApiKey) -> List[dict]
 
 
             # Add the linkBlock        
-            
+
             linkBlock = contents['musicResponsiveListItemRenderer'] \
-                ['overlay'] \
-                    ['musicItemThumbnailOverlayRenderer'] \
-                        ['content'] \
-                            ['musicPlayButtonRenderer'] \
-                                ['playNavigationEndpoint']
+                    ['overlay'] \
+                        ['musicItemThumbnailOverlayRenderer'] \
+                            ['content'] \
+                                ['musicPlayButtonRenderer'].get('playNavigationEndpoint')
 
+            if linkBlock is None:
+                continue
+
             #! detailsBlock is always a list, so we just append the linkBlock to it
             #! insted of carrying along all the other junk from 'musicResponsiveListItemRenderer'
             result.append(linkBlock)