[Flax] remove email icon if no contact is provided
Description; Author first name, last name, contact and/or affiliation are pulled through from the submission.authors
field in the submission form. In some cases, the contact details will not be captured (this is not a required field). Currently, the email icon still remains visible despite the field remaining blank. If the field contains no data then the mail icon should be removed from the article view in Flax.