Storm-pomdp: Print if a result is not available.

src/storm-pomdp-cli/storm-pomdp.cpp

@@ -120,6 +120,7 @@ namespace storm {
                     storm::pomdp::modelchecker::ApproximatePOMDPModelchecker<ValueType> checker = storm::pomdp::modelchecker::ApproximatePOMDPModelchecker<ValueType>(*pomdp, options);
                     std::unique_ptr<storm::pomdp::modelchecker::POMDPCheckResult<ValueType>> result = checker.check(formula);
                     checker.printStatisticsToStream(std::cout);
+                    if (result) {
                         if (storm::utility::resources::isTerminate()) {
                             STORM_PRINT_AND_LOG("Result till abort: ")
                         } else {
@@ -127,6 +128,9 @@ namespace storm {
                         }
                         printResult(result->underApproxValue, result->overApproxValue);
                         analysisPerformed = true;
+                    } else {
+                        STORM_PRINT_AND_LOG("Result: Not available.");
+                    }
                 }
                 if (pomdpSettings.isMemlessSearchSet()) {
                     STORM_LOG_THROW(formulaInfo.isNonNestedReachabilityProbability(), storm::exceptions::NotSupportedException, "Qualitative memoryless scheduler search is not implemented for this property type.");
@@ -241,7 +245,7 @@ namespace storm {
                 
                 auto model = storm::cli::buildPreprocessExportModelWithValueTypeAndDdlib<DdType, ValueType>(symbolicInput, mpi);
                 if (!model) {
-                    STORM_PRINT_AND_LOG("No input model given.");
+                    STORM_PRINT_AND_LOG("No input model given." << std::endl);
                     return;
                 }
                 STORM_LOG_THROW(model->getType() == storm::models::ModelType::Pomdp && model->isSparseModel(), storm::exceptions::WrongFormatException, "Expected a POMDP in sparse representation.");