Make Client.get_tracks raise ZeroConnectedNodes.

Author: LoryCS

wavelink/client.py

@@ -94,8 +94,16 @@ async def get_tracks(self, query: str) -> Optional[list]:
         Union[list, TrackPlaylist, None]:
             A list of or :class:`TrackPlaylist` instance of :class:`Track` objects.
             This could be None if no tracks were found.
+
+        Raises
+        --------
+        ZeroConnectedNodes
+            There are no :class:`wavelink.node.Node`s currently connected.
         """
         node = self.get_best_node()
+        
+        if node is None:
+            raise ZeroConnectedNodes
 
         return await node.get_tracks(query)