prune-packed: only show progress when stderr is a tty

diff --git a/http-push.c b/http-push.c
index 8cc8ee0dfd5c047b2523f63346bf9b30094c1386..00e83dcec1d973b069d4c75105aed96634b00994 100644 (file)
--- a/http-push.c
+++ b/http-push.c
@@ -193,6 +193,8 @@ static char *xml_entities(char *s)
                case '&':
                        strbuf_addstr(&buf, "&");
                        break;
+               case 0:
+                       return strbuf_detach(&buf, NULL);
                }
                s++;
        }