fix error when adding NULL to dict

source/RobotAPI/libraries/aron/core/data/variant/container/Dict.cpp

@@ -161,6 +161,8 @@ namespace armarx::aron::data
     void
     Dict::addElement(const std::string& key, const VariantPtr& data)
     {
+        // Please note that the data may be null (indicating that a non existing maybetype has been added)
+
         if (hasElement(key))
         {
             ARMARX_TRACE;
@@ -173,6 +175,8 @@ namespace armarx::aron::data
     void
     Dict::addElementCopy(const std::string& key, const VariantPtr& data)
     {
+        // Please note that the data may be null (indicating that a non existing maybetype has been added)
+
         if (hasElement(key))
         {
             ARMARX_TRACE;
@@ -213,11 +217,16 @@ namespace armarx::aron::data
     void
     Dict::setElement(const std::string& key, const VariantPtr& data)
     {
-        const auto& p = data->getPath();
-        if (not p.hasDirectPrefix(this->getPath()))
+        // Please note that the data may be null (indicating that a non existing maybetype has been added)
+
+        if (data)
         {
-            ARMARX_WARNING << "An element added to a dict does not have a correct path set. This "
-                              "may cause errors. Please use setElemetCopy() instead.";
+            const auto& p = data->getPath();
+            if (not p.hasDirectPrefix(this->getPath()))
+            {
+                ARMARX_WARNING << "An element added to a dict does not have a correct path set. This "
+                                  "may cause errors. Please use setElemetCopy() instead.";
+            }
         }
 
         this->childrenNavigators[key] = data;
@@ -234,8 +243,14 @@ namespace armarx::aron::data
     void
     Dict::setElementCopy(const std::string& key, const VariantPtr& data)
     {
-        Path newPath = getPath().withElement(key);
-        auto copy = data->cloneAsVariant(newPath);
+        // Please note that the data may be null (indicating that a non existing maybetype has been added)
+
+        VariantPtr copy = nullptr;
+        if (data)
+        {
+            Path newPath = getPath().withElement(key);
+            copy = data->cloneAsVariant(newPath);
+        }
         setElement(key, copy);
     }