Change @changed_fields to \@changed_fields inside a hashref in  Bugzilla::BugMail.
Change @changed_fields to \@changed_fields inside a hashref in 
Bugzilla::BugMail.

https://bugzilla.mozilla.org/show_bug.cgi?id=395451
oyang/bugzilla,ikpcdoctor/git-clone---branch-release-5.0-stable-https-git.mozilla.org-bugzilla-bugzilla-,edmorley/bugzilla,talatdayyan/bugzilla,dklawren/bugzilla,dklawren/bugzilla,GNOME/bugzilla-gnome-org-upstream,talatdayyan/bugzilla,bugzilla/bugzilla,bugzilla/bugzilla,bugzilla/bugzilla,ikpcdoctor/git-clone---branch-release-5.0-stable-https-git.mozilla.org-bugzilla-bugzilla-,GNOME/bugzilla-gnome-org-upstream,oyang/bugzilla,ikpcdoctor/git-clone---branch-release-5.0-stable-https-git.mozilla.org-bugzilla-bugzilla-,talatdayyan/bugzilla,dylanwh/bugzilla,talatdayyan/bugzilla,dklawren/bugzilla,GNOME/bugzilla-gnome-org-upstream,edmorley/bugzilla,dylanwh/bugzilla,ikpcdoctor/git-clone---branch-release-5.0-stable-https-git.mozilla.org-bugzilla-bugzilla-,oyang/bugzilla,oyang/bugzilla,edmorley/bugzilla,GNOME/bugzilla-gnome-org-upstream,dylanwh/bugzilla,edmorley/bugzilla,talatdayyan/bugzilla,bugzilla/bugzilla,dklawren/bugzilla,GNOME/bugzilla-gnome-org-upstream,ikpcdoctor/git-clone---branch-release-5.0-stable-https-git.mozilla.org-bugzilla-bugzilla-,edmorley/bugzilla,oyang/bugzilla,dylanwh/bugzilla,dylanwh/bugzilla,dklawren/bugzilla