* Skip deleted plot widgets in RiuMultiPlotBook::visiblePlotWidgets
* Guard missing calculation in detectCyclicCalculation
* Guard invalid node index in RigFemPart node lookups
* Guard null well path in RimWellLogExtractionCurve::extractGeomData
* Guard unopened case in RimGridCalculation::removeDependentObjects
* Guard empty subset in createLateralAtMeasuredDepth