Ident and type are optional

Update the code to accommodate this.  Originally reported by Reinis
Rozitis (r at roze.lv) on varnish-misc.

Fixes #2118.

bin/varnishtest/tests/u00002.vtc

@@ -24,3 +24,7 @@ shell "grep -q mempool ${tmpdir}/p2/stdout"
 err_shell "" "grep -q LCK.vbe.destroy ${tmpdir}/p2/stdout"
 
 shell "cmp -s ${tmpdir}/p1/stdout ${tmpdir}/p2/stdout"
+
+process p3 {varnishstat -1 -n ${v1_name} -f MAIN.cache_hit} -run
+
+shell "grep -q cache_hit ${tmpdir}/p3/stdout"

lib/libvarnishapi/vsc.c

@@ -379,10 +379,13 @@ vsc_filter_pt_list(struct VSM_data *vd)
 		VTAILQ_FOREACH_SAFE(pt, &vsc->pt_list, list, pt2) {
 			CHECK_OBJ_NOTNULL(pt, VSC_PT_MAGIC);
 			VSB_clear(vsb);
-			VSB_printf(vsb, "%s.%s.%s",
-			    pt->point.section->type,
-			    pt->point.section->ident,
-			    pt->point.desc->name);
+			if (strcmp(pt->point.section->type, ""))
+				VSB_printf(vsb, "%s.",
+				    pt->point.section->type);
+			if (strcmp(pt->point.section->ident, ""))
+				VSB_printf(vsb, "%s.",
+				    pt->point.section->ident);
+			VSB_printf(vsb, "%s", pt->point.desc->name);
 			VSB_finish(vsb);
 			if (fnmatch(sf->pattern, VSB_data(vsb), 0))
 				continue;