Remove check for if request is finished in EventListener.get_event since websockets finish early

changelog/59183.fixed

@@ -0,0 +1 @@
+Fixed saltnado websockets disconnecting immediately

salt/netapi/rest_tornado/saltnado.py

@@ -332,13 +332,6 @@ class EventListener:
         """
         Get an event (asynchronous of course) return a future that will get it later
         """
-        # if the request finished, no reason to allow event fetching, since we
-        # can't send back to the client
-        if request._finished:
-            future = Future()
-            future.set_exception(TimeoutException())
-            return future
-
         future = Future()
         if callback is not None:
 

tests/pytests/functional/netapi/rest_tornado/test_event_listener.py

@@ -13,7 +13,7 @@ class Request:
     __slots__ = ("_finished",)
 
     def __init__(self):
-        self._finished = False
+        self._finished = True
 
 
 @pytest.fixture