[geary: 2/2] Merge branch 'mjog/fix-build-warnings' into 'mainline'

[Michael Gratton <mjog src gnome org>]

commit a0977b8525775821819757f64963e89f4b2ed6ff
Merge: 8da584a4 7c56f269
Author: Michael Gratton <mike vee net>
Date:   Thu Oct 10 20:51:58 2019 +0000

    Merge branch 'mjog/fix-build-warnings' into 'mainline'
    
    Fix misc null and deprecation build warnings
    
    See merge request GNOME/geary!337

 .../application/application-plugin-manager.vala       | 10 ++++++++--
 src/client/composer/composer-widget.vala              | 19 -------------------
 .../conversation-list/conversation-list-view.vala     |  4 ++--
 src/client/util/util-migrate.vala                     |  8 ++++----
 4 files changed, 14 insertions(+), 27 deletions(-)
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