D23310: Fix crash on exit

[Albert Astals Cid]

aacid created this revision.
Herald added a project: KDE Edu.
Herald added a subscriber: kde-edu.
aacid requested review of this revision.

REVISION SUMMARY
  How to reproduce:
  
  - Open step
  - Add stick
  - Delete stick
  - Close step

REPOSITORY
  R341 Step

BRANCH
  Applications/19.08

REVISION DETAIL
  https://phabricator.kde.org/D23310

AFFECTED FILES
  step/mainwindow.cc

To: aacid
Cc: kde-edu, narvaez, apol
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