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Internal helper function for attachment checking in messages.
has_attachment(msg)
An object of class character containing the whole MIME message.
character
A logical containing TRUE if there is one or more attachments and FALSE if there is none.
logical
TRUE
FALSE
Other attachments helper: check_args_get_attachments, check_args_list_attachments
check_args_get_attachments
check_args_list_attachments