FIXED: library(http/http_log): exception when logging was disabled.

Harmless as the exception was printed but otherwise ignored.

Author: JanWielemaker

http_log.pl

@@ -269,13 +269,16 @@
 %   @param  Filled with sequence identifier for the request
 
 log_started(Request, Id, Stream) :-
+    is_stream(Stream),
+    !,
     get_time(Now),
     add_post_data(Request, Request1),
     log_request(Request1, LogRequest),
     format_time(string(HDate), '%+', Now),
     format(Stream,
            '/*~s*/ request(~q, ~3f, ~q).~n',
            [HDate, Id, Now, LogRequest]).
+log_started(_, _, _).
 
 %!  log_request(+Request, -Log)
 %