Re: [PATCH] Fixed crash in fetching remote tags when there is not tags.

Still, I'd suggest move the test into the caller, firstly because it
is the only place that special. Also, I can't think of a proper reason
to add a NULL ref to a reflist, and so the crashing tail_link_ref will
help us find the callers which use tail_link_ref incorrectly
(illogically too).

As the result of patter expansion can be NULL (empty pattern, as it
seems), lets just check for it. I parked the patch below locally.

diff --git a/remote.c b/remote.c
index 5e92378..58d63ed 100644
--- a/remote.c
+++ b/remote.c

@@ -884,7 +884,8 @@ int get_fetch_map(struct ref *remote_refs,
 			    rm->peer_ref->name);
 	}
 
-	tail_link_ref(ref_map, tail);
+	if (ref_map)
+		tail_link_ref(ref_map, tail);
 
 	return 0;
 }