JaniTraverser: Only traverse lower/upper bound expressions of BoundedIntegerVariables, if these bounds exists.

src/storm/storage/jani/FunctionEliminator.cpp

@@ -334,9 +334,13 @@ namespace storm {
                     if (variable.hasInitExpression()) {
                         variable.setInitExpression(functionEliminationVisitor->eliminate(variable.getInitExpression()));
                     }
+                    if (variable.hasLowerBound()) {
                         variable.setLowerBound(functionEliminationVisitor->eliminate(variable.getLowerBound()));
+                    }
+                    if (variable.hasUpperBound()) {
                         variable.setUpperBound(functionEliminationVisitor->eliminate(variable.getUpperBound()));
                     }
+                }
                 
                 void traverse(UnboundedIntegerVariable& variable, boost::any const& data) override {
                     if (variable.hasInitExpression()) {

src/storm/storage/jani/traverser/JaniTraverser.cpp

@@ -95,9 +95,13 @@ namespace storm {
             if (variable.hasInitExpression()) {
                 traverse(variable.getInitExpression(), data);
             }
+            if (variable.hasLowerBound()) {
                 traverse(variable.getLowerBound(), data);
+            }
+            if (variable.hasUpperBound()) {
                 traverse(variable.getUpperBound(), data);
             }
+        }
         
         void JaniTraverser::traverse(UnboundedIntegerVariable& variable, boost::any const& data) {
             if (variable.hasInitExpression()) {
@@ -276,9 +280,13 @@ namespace storm {
             if (variable.hasInitExpression()) {
                 traverse(variable.getInitExpression(), data);
             }
+            if (variable.hasLowerBound()) {
                 traverse(variable.getLowerBound(), data);
+            }
+            if (variable.hasUpperBound()) {
                 traverse(variable.getUpperBound(), data);
             }
+        }
         
         void ConstJaniTraverser::traverse(UnboundedIntegerVariable const& variable, boost::any const& data) {
             if (variable.hasInitExpression()) {