Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  c1e8151edfa20d01084627aa720db46309feaff6

QA: refactor reply test

* use when_present properly
* use proper equality check
* remove unnecessary single-line page action
* add assertions to Then steps

Change-Id: If573a972c04f2fcc22935fcf006bd0b7bfca8935