json: Made jlookup return 0 for empty arrays/dicts

util/json.c

@@ -163,9 +163,12 @@ char *jenter(char *s)
 	if (!s)
 		return 0;
 	s = skip_ws(s);
-	if (*s == '[' || *s == '{')
-		return s+1;
+	if (*s != '[' && *s != '{')
+		return 0;
+	s = skip_ws(s+1);
+	if (*s == ']' || *s == '}')
 		return 0;
+	return s;
 }
 
 char *jnext(char *s)