[Integrated] RFR: Improve MimeText conformance

[Robin Westberg]

Changeset: 483310ea
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2019-11-20 12:53:23 +0000
URL:       https://git.openjdk.java.net/skara/commit/483310ea

Improve MimeText conformance

Reviewed-by: ehelin

! email/src/main/java/org/openjdk/skara/email/MimeText.java
! email/src/test/java/org/openjdk/skara/email/MimeTextTests.java