Remove not supported attribute tags from description.

[Bashev]

…r empty description.

1. Meta not support attributes in the allowed tags used in the description (rich_description), but sometimes in they can be added from wyswyg editor. We just remove them.

2. Added fallback if product description and short_description are both missing, use product name instead of sending empty string.

Description (*)

Story

Bug

Task

Fixed Issues (if relevant)

1. magento-commerce/facebook-for-magento2#<issue_number>: Issue title

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[zlik]

@Bashev, please correct me if I'm wrong but don't think there's any harm in sending those extra attributes. Also, if a description is empty, using name as description provides no incremental gain to catalog quality. If you need this as a fallback, feel free to extend the functionality in your custom build. Closing the PR for now but feel free to submit a new one if you disagree or if you have more thoughts / ideas. Thank you!