It was originally in the send button, and in case the send button is
hidden, the hook is not called, and the inner validation which
is subscribed to changes has outdated data.
[MAILPOET-6393]
The difference between getCurrentTemplate and getEditedPostTemplate,
which is also internally used in getTemplateContent
is that getCurrentTemplate always returns the template associated with the email,
but getEditedPostTemplate returns the template associated with the currently edited post
and this doesn't give us correct data in the template mode because in the template mode
the edited post is the template.
[MAILPOET-6393]
