Missing $debugHintsPath when sending email via command

[cykirsch]

Preconditions

1. Magento 2.1

Steps to reproduce

1. Create a console command that sends an email, where the email also loads in another block like {{layout handle="sales_email_order_items" order=$order area="frontend"}}

Expected result

1. Email should send without error.

Actual result

1. Email fails with error

main.CRITICAL: exception 'BadMethodCallException' with message 'Missing required argument $debugHintsPath of Magento\Developer\Model\TemplateEngine\Plugin\DebugHints.' in /.../.../magento/vendor/magento/framework/ObjectManager/Factory/Dynamic/Developer.php:45

More info

A workaround was found and posted on these sites:
https://community.magento.com/t5/Programming-Questions/Email-template-with-block/m-p/50061#M1219
https://magento.stackexchange.com/questions/152089/magento2-command-line-sending-email-using-block-templates-error-missing-r

Unfortunately it requires invoking object manager directly, as it seems the object manager's configuration is what needs to be corrected. Since direct loading of the object manager is not best practice, if modifying this config is the only solution then a method should be provided to modify the config without loading object manager directly.

[magento-engcom-team]

@cykirsch, thank you for your report.
We've created internal ticket(s) MAGETWO-81170 to track progress on the issue.

[nemesis-back]

@okorshenko I will work on it #SQUASHTOBERFEST