Add back a check that was lost: You must have at least one backend.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@1391 d4fa192b-c00b-0410-8231-f00ffab90ce4

lib/libvcl/vcc_compile.c

@@ -627,6 +627,14 @@ vcc_CompileSource(struct vsb *sb, struct source *sp)
 	if (tl->err)
 		return (vcc_DestroyTokenList(tl, NULL));
 
+	/* Check if we have any backends at all */
+	if (tl->nbackend == 0) {
+		vsb_printf(tl->sb,
+		    "No backends in VCL program, at least one is necessary.\n");
+		tl->err = 1;
+		return (vcc_DestroyTokenList(tl, NULL));
+	}
+
 	/* Check for orphans */
 	if (vcc_CheckReferences(tl))
 		return (vcc_DestroyTokenList(tl, NULL));