JANI assignment levels: we support index/levels other than zero (although most builders wont support them)

src/storm/storage/jani/Assignment.cpp

@@ -9,7 +9,7 @@ namespace storm  {
     namespace jani {
         
         Assignment::Assignment(storm::jani::Variable const& variable, storm::expressions::Expression const& expression, uint64_t level) : variable(variable), expression(expression), level(level) {
-            STORM_LOG_THROW(level == 0, storm::exceptions::NotImplementedException, "Assignment levels other than 0 are currently not supported.");
+
         }
         
         bool Assignment::operator==(Assignment const& other) const {