Code review comment for lp:~alan-griffiths/miral/fix-1717061

FAILED: Autolanding.
More details in the following jenkins job:
https://mir-jenkins.ubuntu.com/job/miral-autolanding/44/
Executed test runs:
    FAILURE: https://mir-jenkins.ubuntu.com/job/build-miral/125/console
    None: https://mir-jenkins.ubuntu.com/job/generic-land-mp/1554/console
    SUCCESS: https://mir-jenkins.ubuntu.com/job/build-0-fetch/5252
    SUCCESS: https://mir-jenkins.ubuntu.com/job/build-1-sourcepkg/release=artful/5240
    SUCCESS: https://mir-jenkins.ubuntu.com/job/build-1-sourcepkg/release=xenial/5240
    SUCCESS: https://mir-jenkins.ubuntu.com/job/build-1-sourcepkg/release=zesty/5240
    SUCCESS: https://mir-jenkins.ubuntu.com/job/build-2-binpkg-miral/arch=amd64,release=artful/129
        deb: https://mir-jenkins.ubuntu.com/job/build-2-binpkg-miral/arch=amd64,release=artful/129/artifact/output/*zip*/output.zip
    SUCCESS: https://mir-jenkins.ubuntu.com/job/build-2-binpkg-miral/arch=amd64,release=xenial/129
        deb: https://mir-jenkins.ubuntu.com/job/build-2-binpkg-miral/arch=amd64,release=xenial/129/artifact/output/*zip*/output.zip
    SUCCESS: https://mir-jenkins.ubuntu.com/job/build-2-binpkg-miral/arch=amd64,release=zesty/129
        deb: https://mir-jenkins.ubuntu.com/job/build-2-binpkg-miral/arch=amd64,release=zesty/129/artifact/output/*zip*/output.zip
    SUCCESS: https://mir-jenkins.ubuntu.com/job/build-2-binpkg-miral/arch=i386,release=artful/129
        deb: https://mir-jenkins.ubuntu.com/job/build-2-binpkg-miral/arch=i386,release=artful/129/artifact/output/*zip*/output.zip
    SUCCESS: https://mir-jenkins.ubuntu.com/job/build-2-binpkg-miral/arch=i386,release=xenial/129
        deb: https://mir-jenkins.ubuntu.com/job/build-2-binpkg-miral/arch=i386,release=xenial/129/artifact/output/*zip*/output.zip
    FAILURE: https://mir-jenkins.ubuntu.com/job/build-2-binpkg-miral/arch=i386,release=zesty/129/console