Merge branch 'master' of https://github.com/sjunges/storm

src/storm/storage/expressions/PredicateExpression.cpp

@@ -143,10 +143,12 @@ namespace storm {
                 case PredicateExpression::PredicateType::AtLeastOneOf: stream << "atLeastOneOf(";
                 case PredicateExpression::PredicateType::ExactlyOneOf: stream << "exactlyOneOf(";
             }
+            if (!operands.empty()) {
                 stream << *operands[0];
                 for (uint64_t i = 1; i < operands.size(); i++) {
                     stream << ", " << *operands[i];
                 }
+            }
             stream << ")";
         }
     }