Port `Actor._stream_handler()` to use `.has_outcome`, fix indent bug..

tractor/_runtime.py

@@ -1140,7 +1140,6 @@ class Actor:
             requester_type,
             req_chan,
             log_meth,
-
         ) = (
             req_chan.uid,
             'peer',
@@ -1173,7 +1172,11 @@ class Actor:
             # with the root actor in this tree
             debug_req = _debug.DebugStatus
             lock_req_ctx: Context = debug_req.req_ctx
-            if lock_req_ctx is not None:
+            if (
+                lock_req_ctx
+                and
+                lock_req_ctx.has_outcome
+            ):
                 msg += (
                     '-> Cancelling active debugger request..\n'
                     f'|_{_debug.Lock.repr()}\n\n'