cookies: ensure that we have cookies before writing jar

The jar should be written iff there are cookies, so ensure that we still
have cookies after expiration to avoid creating an empty file.

Closes #2529

diff --git a/lib/cookie.c b/lib/cookie.c
index 9c90c2a385864e8f6fbab49e81212e7abae0000a..5eb3c1209db39a9ddbbac7be571de9929b0d4a08 100644 (file)
--- a/lib/cookie.c
+++ b/lib/cookie.c
@@ -1442,6 +1442,10 @@ static int cookie_output(struct CookieInfo *c, const char *dumphere)
   /* at first, remove expired cookies */
   remove_expired(c);
 
+  /* make sure we still have cookies after expiration */
+  if(0 == c->numcookies)
+    return 0;
+
   if(!strcmp("-", dumphere)) {
     /* use stdout */
     out = stdout;