Fixed bug#4255 - RichText is not coupled with RichTextViewing. Rich Text is being shown, even if the text/plain MIME part is available.
Fixed bug#4255 - RichText is not coupled with RichTextViewing. Rich Text is being shown, even if the text/plain MIME part is available.

djoudi/otrs-gitimport-test,djoudi/otrs-gitimport-test,djoudi/otrs-gitimport-test