storm-conv: Fixed wrong jani export of step-bounded until properties in discrete time models.

src/storm/storage/jani/JSONExporter.cpp

@@ -253,7 +253,7 @@ namespace storm {
                 modernjson::json propertyInterval = constructPropertyInterval(lower, lowerExclusive, upper, upperExclusive);
     
                 auto tbr = f.getTimeBoundReference(i);
-                if (tbr.isStepBound()) {
+                if (tbr.isStepBound() || (model.isDiscreteTimeModel() && tbr.isTimeBound())) {
                     STORM_LOG_THROW(!hasStepBounds, storm::exceptions::NotSupportedException, "Jani export of until formulas with multiple step bounds is not supported.");
                     hasStepBounds = true;
                     opDecl["step-bounds"] = propertyInterval;
@@ -268,7 +268,7 @@ namespace storm {
                     rewbound["bounds"] = propertyInterval;
                     rewardBounds.push_back(std::move(rewbound));
                 } else {
-                    STORM_LOG_THROW(!hasTimeBounds, storm::exceptions::NotSupportedException, "Jani export of until formulas with multiple step bounds is not supported.");
+                    STORM_LOG_THROW(!hasTimeBounds, storm::exceptions::NotSupportedException, "Jani export of until formulas with multiple time bounds is not supported.");
                     hasTimeBounds = true;
                     opDecl["time-bounds"] = propertyInterval;
                 }