add version control for member_buy::extra_info

mobile/control/member_buy.php

@@ -287,6 +287,9 @@ class member_buyControl extends mbMemberControl
                 if (isset($input[$item])) {
                     $extra['input'][$item] = $input[$item];
                 }
+                elseif(session_helper::version_code() <= 171 && $item == "phone_no") {
+                    $extra['input'][$item] = "";
+                }
                 else {
                     Log::record("{$goods_id}号商品,在提交订单中,缺少{$item}字段.", Log::ERR);
                     return [false, [], ''];