"Undefined property" warnings during sync

Problem/Motivation

While running a manual sync I get loads of messages like the following in the dblogs:

Warning: Undefined property: stdClass::$product in Drupal\media_acquiadam\Service\AssetMetadataHelper->getMetadataFromAsset() (line 156 of /app/docroot/modules/contrib/media_acquiadam/src/Service/AssetMetadataHelper.php)

This is in version 2.0.6 where that line corresponds to

if (is_array($asset->metadata->fields->{$name}) && !empty($asset->metadata->fields->{$name})) {

Proposed resolution

Add a check to defend against and undefined property.

Remaining tasks

User interface changes

none

API changes

none

Data model changes

none