D14098: Avoid "QObject::disconnect: Unexpected null parameter" error on application stop

[Martin Koller]

mkoller added reviewers: sanjibanb, rahn.

REPOSITORY
  R34 Marble

REVISION DETAIL
  https://phabricator.kde.org/D14098

To: mkoller, #marble, sanjibanb, rahn
Cc: marble-devel, kde-edu, torhamzed, jalvarez, tjakobi, mnafees, shentey, chaz6, dkolozsvari, narvaez, cmihalache, rahn, apol, nienhueser
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