Merge branch 'delegate_crash_fix' into 'master'

Add a missing null pointer check

See merge request OpenMW/openmw!4210

apps/opencs/view/world/datadisplaydelegate.cpp

@@ -45,7 +45,8 @@ CSVWorld::DataDisplayDelegate::DataDisplayDelegate(const ValueList& values, cons
     , mUiScale(static_cast<QGuiApplication*>(QGuiApplication::instance())->devicePixelRatio())
     , mSettingKey(pageName + '/' + settingName)
 {
-    parent->installEventFilter(this);
+    if (parent)
+        parent->installEventFilter(this);
 
     buildPixmaps();