fix peer search using inexistent variable, fix test to cover it

lbrynet/dht/node.py

@@ -201,7 +201,6 @@ class Node:
         try:
             async with peer_generator as junction:
                 yield junction
-            await peer_generator.finished.wait()
         finally:
             if add_hashes_task and not (add_hashes_task.done() or add_hashes_task.cancelled()):
                 add_hashes_task.cancel()

tests/unit/dht/test_blob_announcer.py

@@ -105,7 +105,7 @@ class TestBlobAnnouncer(AsyncioTestCase):
 
             _, task = last.accumulate_peers(search_q, peer_q)
             found_peers = await peer_q.get()
-            task.cancel()
+            await task
 
             self.assertEqual(1, len(found_peers))
             self.assertEqual(self.node.protocol.node_id, found_peers[0].node_id)