+ ASSERT to prevent calling nullptr

GUI/Model/Beam/BeamAngleItems.cpp

@@ -14,6 +14,7 @@
 
 #include "GUI/Model/Beam/BeamAngleItems.h"
 #include "Base/Const/Units.h"
+#include "Base/Util/Assert.h"
 #include "GUI/Model/Descriptor/DistributionItems.h"
 
 BeamAzimuthalAngleItem::BeamAzimuthalAngleItem()
@@ -31,6 +32,7 @@ void BeamAzimuthalAngleItem::readFrom(QXmlStreamReader* r)
 void BeamAzimuthalAngleItem::initDistribution(DistributionItem* newDistribution,
                                               const DistributionItem* currentDistribution)
 {
+    ASSERT(newDistribution);
     double meanVal = 0.0;
     if (const auto* cd = dynamic_cast<const SymmetricResolutionItem*>(currentDistribution))
         meanVal = cd->mean();

GUI/Model/Beam/BeamWavelengthItem.cpp

@@ -13,6 +13,7 @@
 //  ************************************************************************************************
 
 #include "GUI/Model/Beam/BeamWavelengthItem.h"
+#include "Base/Util/Assert.h"
 #include "GUI/Model/Descriptor/DistributionItems.h"
 
 namespace {
@@ -22,6 +23,7 @@ const double default_wl = 0.1;
 void initDistribution(DistributionItem* newDistribution,
                       const DistributionItem* currentDistribution)
 {
+    ASSERT(newDistribution);
     double meanVal = default_wl;
     if (const auto* cd = dynamic_cast<const SymmetricResolutionItem*>(currentDistribution))
         meanVal = cd->mean();

GUI/Model/Beam/GrazingScanItem.cpp

@@ -33,6 +33,7 @@ const QString BaseData("BaseData");
 
 } // namespace Tag
 
+
 void setAxisPresentationDefaults(BasicAxisItem* axisItem)
 {
     ASSERT(axisItem);
@@ -46,6 +47,7 @@ void setAxisPresentationDefaults(BasicAxisItem* axisItem)
 void initDistribution(DistributionItem* newDistribution,
                       const DistributionItem* currentDistribution)
 {
+    ASSERT(newDistribution);
     double meanVal = 0.0;
     if (const auto* cd = dynamic_cast<const SymmetricResolutionItem*>(currentDistribution))
         meanVal = cd->mean();

GUI/Model/Device/InstrumentItems.cpp

@@ -408,6 +408,7 @@ bool SpecularInstrumentItem::alignedWith(const DatafileItem* item) const
 Frame SpecularInstrumentItem::makeFrame() const
 {
     auto* axis_item = scanItem()->inclinationAxisItem();
+    ASSERT(axis_item);
 
     if (auto* pointwise_axis = dynamic_cast<PointwiseAxisItem*>(axis_item)) {
         if (!pointwise_axis->axis()) // workaround for loading project