Merge pull request #7041 from rabbitmq/mergify/bp/v3.11.x/pr-7040

Fix empty channel detail format in management api (backport #7040)

Author: michaelklishin

deps/rabbitmq_management_agent/src/rabbit_mgmt_format.erl

@@ -540,10 +540,13 @@ clean_channel_details(Obj) ->
          undefined -> Obj0;
          Chd ->
              pset(channel_details,
-                  lists:keydelete(pid, 1, Chd),
+                  format_channel_details(lists:keydelete(pid, 1, Chd)),
                   Obj0)
      end.
 
+format_channel_details([]) -> #{};
+format_channel_details(Any) -> Any.
+
 -spec format_consumer_arguments(proplists:proplist()) -> proplists:proplist().
 format_consumer_arguments(Obj) ->
     case pget(arguments, Obj) of