Do not bundle empty files

src/vmod_zipflow.c

@@ -578,14 +578,18 @@ vdp_zipsub_init(VRT_CTX, struct vdp_ctx *vdc, void **priv, struct objcore *oc)
 
 	zft = zipsub_take(zfr);
 
+	req = vdc->req;
+	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
+
+	if (req->resp_len == 0)
+		zfr->bundle = 0;
+
 	if (zfr->bundle) {
 		fill_meta(ctx, zfr);
 		AZ(zip_meta(zft->zip, zfr->name, 3, zfr->mode,
 			(uint32_t)zfr->atime, (uint32_t)zfr->mtime));
 	}
 
-	req = vdc->req;
-	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
 	RFC2616_Weaken_Etag(req->resp);
 	if (req->resp_len != 0)
 		req->resp_len = -1;