PageCurationToolbar: Don't send "I have unreviewed a page you curated" message, if text area is empty
PageCurationToolbar: Don't send "I have unreviewed a page you curated" message, if text area is empty

Bug: T204465
Change-Id: I42f03c5f8b1074b8df5d5e0f1127e2c5101e006a

wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage