D20079: Fix crash due to using an attribute from a collection that went out of scope

[David Faure]

dfaure created this revision.
dfaure added reviewers: dvratil, winterz.
Herald added a project: KDE PIM.
dfaure requested review of this revision.

REVISION SUMMARY
  Probably a consequence of the const/non-const changes (detaching?)

TEST PLAN
  Untested, but based on a crash report by Allen, pointing to
  ETMCalendar::alarms() calling BlockAlarmsAttribute::isAlarmTypeBlocked
  on line 579.

REPOSITORY
  R170 Akonadi Calendar

BRANCH
  Applications/19.04

REVISION DETAIL
  https://phabricator.kde.org/D20079

AFFECTED FILES
  src/etmcalendar.cpp

To: dfaure, dvratil, winterz
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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